NegotiateStream.xml

<Type Name="NegotiateStream" FullName="System.Net.Security.NegotiateStream">
  <TypeSignature Language="C#" Value="public class NegotiateStream : System.Net.Security.AuthenticatedStream" />
  <TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit NegotiateStream extends System.Net.Security.AuthenticatedStream" />
  <TypeSignature Language="DocId" Value="T:System.Net.Security.NegotiateStream" />
  <TypeSignature Language="VB.NET" Value="Public Class NegotiateStream&#xA;Inherits AuthenticatedStream" />
  <TypeSignature Language="F#" Value="type NegotiateStream = class&#xA;    inherit AuthenticatedStream" />
  <TypeSignature Language="C++ CLI" Value="public ref class NegotiateStream : System::Net::Security::AuthenticatedStream" />
  <AssemblyInfo>
    <AssemblyName>System.Net.Security</AssemblyName>
    <AssemblyVersion>4.0.0.0</AssemblyVersion>
    <AssemblyVersion>4.1.0.0</AssemblyVersion>
    <AssemblyVersion>4.1.1.0</AssemblyVersion>
    <AssemblyVersion>4.1.2.0</AssemblyVersion>
    <AssemblyVersion>5.0.0.0</AssemblyVersion>
    <AssemblyVersion>6.0.0.0</AssemblyVersion>
    <AssemblyVersion>7.0.0.0</AssemblyVersion>
    <AssemblyVersion>8.0.0.0</AssemblyVersion>
    <AssemblyVersion>9.0.0.0</AssemblyVersion>
    <AssemblyVersion>10.0.0.0</AssemblyVersion>
  </AssemblyInfo>
  <AssemblyInfo>
    <AssemblyName>System</AssemblyName>
    <AssemblyVersion>2.0.0.0</AssemblyVersion>
    <AssemblyVersion>2.0.5.0</AssemblyVersion>
    <AssemblyVersion>4.0.0.0</AssemblyVersion>
  </AssemblyInfo>
  <AssemblyInfo>
    <AssemblyName>netstandard</AssemblyName>
    <AssemblyVersion>2.0.0.0</AssemblyVersion>
    <AssemblyVersion>2.1.0.0</AssemblyVersion>
  </AssemblyInfo>
  <TypeForwardingChain>
    <TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Security" ToVersion="10.0.0.0" FrameworkAlternate="net-10.0" />
    <TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Security" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
    <TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Security" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
    <TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Security" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
    <TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Security" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
    <TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Security" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
  </TypeForwardingChain>
  <Base>
    <BaseTypeName>System.Net.Security.AuthenticatedStream</BaseTypeName>
  </Base>
  <Interfaces />
  <Attributes>
    <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
      <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
      <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(0)&gt;]</AttributeName>
    </Attribute>
    <Attribute FrameworkAlternate="net-6.0;net-7.0">
      <AttributeName Language="C#">[System.Runtime.Versioning.UnsupportedOSPlatform("tvos")]</AttributeName>
      <AttributeName Language="F#">[&lt;System.Runtime.Versioning.UnsupportedOSPlatform("tvos")&gt;]</AttributeName>
    </Attribute>
  </Attributes>
  <Docs>
    <summary>Provides a stream that uses the Negotiate security protocol to authenticate the client, and optionally the server, in client-server communication.</summary>
    <remarks>
      <format type="text/markdown"><![CDATA[

## Remarks
 Use the <xref:System.Net.Security.NegotiateStream> class for authentication and to help secure information transmitted between a client and a server. Using <xref:System.Net.Security.NegotiateStream>, you can do the following.

- Send the client's credentials to the server for Impersonation or Delegation.
- Request server authentication.
- Encrypt and/or sign data before transmitting it.

 Authentication must be performed before transmitting information. Clients request authentication using the synchronous <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> methods, which block until the authentication completes, or the asynchronous <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A> methods, which do not block while waiting for the authentication to complete. Servers request authentication using the synchronous <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> or asynchronous <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods. The client, and optionally the server, is authenticated using the Negotiate security protocol. The Kerberos protocol is used for authentication if both client and server support it; otherwise NTLM is used. The <xref:System.Net.Security.NegotiateStream> class performs the authentication using the Security Support Provider Interface (SSPI).

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services will be used by the <xref:System.Net.Security.NegotiateStream> to help secure your data during transmission. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred. You can get information about the remote client or server using the <xref:System.Net.Security.NegotiateStream.RemoteIdentity%2A> property.

 If the authentication fails, you will receive an <xref:System.Security.Authentication.AuthenticationException> or a <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 You send data using the synchronous <xref:System.Net.Security.NegotiateStream.Write%2A> or asynchronous <xref:System.Net.Security.NegotiateStream.BeginWrite%2A> or <xref:System.Net.Security.NegotiateStream.WriteAsync%2A> methods. You receive data using the synchronous <xref:System.Net.Security.NegotiateStream.Read%2A> or asynchronous <xref:System.Net.Security.NegotiateStream.ReadAsync%2A> or <xref:System.Net.Security.NegotiateStream.BeginRead%2A> methods. If security services such as encryption or signing are enabled, these are automatically applied to your data by the <xref:System.Net.Security.NegotiateStream>.

 The <xref:System.Net.Security.NegotiateStream> transmits data using a stream that you supply when creating the <xref:System.Net.Security.NegotiateStream>. When you supply this underlying stream, you have the option to specify whether closing the <xref:System.Net.Security.NegotiateStream> also closes the underlying stream.

## Examples

The following example demonstrates the client side of a client-server connection that uses the <xref:System.Net.Security.NegotiateStream>. The client authenticates and sends a message to the server asynchronously.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/AuthenticatedStream/Overview/client.cs" id="Snippet0":::
:::code language="vb" source="~/snippets/visualbasic/System.Net.Security/AuthenticatedStream/Overview/client.vb" id="Snippet0":::

The following code example demonstrates the server side of a client-server connection that uses the <xref:System.Net.Security.NegotiateStream> to authenticate the client and read a message sent by the client.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/Overview/server.cs" id="Snippet0":::

 ]]></format>
    </remarks>
    <related type="Article" href="/dotnet/framework/network-programming/changes-to-ntlm-authentication-for-httpwebrequest-in-version-3-5-sp1">Changes to NTLM authentication for HTTPWebRequest in Version 3.5 SP1</related>
  </Docs>
  <Members>
    <MemberGroup MemberName=".ctor">
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Initializes a new instance of the <see cref="T:System.Net.Security.NegotiateStream" /> class.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 To prevent the <xref:System.Net.Security.NegotiateStream> from closing the stream that you supply, use the <xref:System.Net.Security.NegotiateStream.%23ctor%28System.IO.Stream%2CSystem.Boolean%29> constructor.

 ]]></format>
        </remarks>
      </Docs>
    </MemberGroup>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public NegotiateStream (System.IO.Stream innerStream);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.IO.Stream innerStream) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.#ctor(System.IO.Stream)" />
      <MemberSignature Language="VB.NET" Value="Public Sub New (innerStream As Stream)" />
      <MemberSignature Language="F#" Value="new System.Net.Security.NegotiateStream : System.IO.Stream -&gt; System.Net.Security.NegotiateStream" Usage="new System.Net.Security.NegotiateStream innerStream" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; NegotiateStream(System::IO::Stream ^ innerStream);" />
      <MemberType>Constructor</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <Parameters>
        <Parameter Name="innerStream" Type="System.IO.Stream" />
      </Parameters>
      <Docs>
        <param name="innerStream">A <see cref="T:System.IO.Stream" /> object used by the <see cref="T:System.Net.Security.NegotiateStream" /> for sending and receiving data.</param>
        <summary>Initializes a new instance of the <see cref="T:System.Net.Security.NegotiateStream" /> class using the specified <see cref="T:System.IO.Stream" />.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Examples

 The following code example demonstrates calling this constructor.

 :::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet3":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public NegotiateStream (System.IO.Stream innerStream, bool leaveInnerStreamOpen);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.IO.Stream innerStream, bool leaveInnerStreamOpen) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.#ctor(System.IO.Stream,System.Boolean)" />
      <MemberSignature Language="VB.NET" Value="Public Sub New (innerStream As Stream, leaveInnerStreamOpen As Boolean)" />
      <MemberSignature Language="F#" Value="new System.Net.Security.NegotiateStream : System.IO.Stream * bool -&gt; System.Net.Security.NegotiateStream" Usage="new System.Net.Security.NegotiateStream (innerStream, leaveInnerStreamOpen)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; NegotiateStream(System::IO::Stream ^ innerStream, bool leaveInnerStreamOpen);" />
      <MemberType>Constructor</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Parameters>
        <Parameter Name="innerStream" Type="System.IO.Stream" />
        <Parameter Name="leaveInnerStreamOpen" Type="System.Boolean" />
      </Parameters>
      <Docs>
        <param name="innerStream">A <see cref="T:System.IO.Stream" /> object used by the <see cref="T:System.Net.Security.NegotiateStream" /> for sending and receiving data.</param>
        <param name="leaveInnerStreamOpen">
          <see langword="true" /> to indicate that closing this <see cref="T:System.Net.Security.NegotiateStream" /> has no effect on <paramref name="innerStream" />; <see langword="false" /> to indicate that closing this <see cref="T:System.Net.Security.NegotiateStream" /> also closes <paramref name="innerStream" />.</param>
        <summary>Initializes a new instance of the <see cref="T:System.Net.Security.NegotiateStream" /> class using the specified <see cref="T:System.IO.Stream" /> and stream closure behavior.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 When you specify `true` for the `leaveStreamOpen` parameter, closing the <xref:System.Net.Security.NegotiateStream> has no effect on the `innerStream` stream; you must explicitly close `innerStream` when you no longer need it.

## Examples

The following example demonstrates calling this constructor. This code example is part of a larger example provided for the <xref:System.Net.Security.NegotiateStream> class.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/AuthenticatedStream/Overview/client.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/System.Net.Security/AuthenticatedStream/Overview/client.vb" id="Snippet1":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="innerStream" /> is <see langword="null" />.

-or-

 <paramref name="innerStream" /> is equal to <see cref="F:System.IO.Stream.Null" />.</exception>
      </Docs>
    </Member>
    <MemberGroup MemberName="AuthenticateAsClient">
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection.</summary>
      </Docs>
    </MemberGroup>
    <Member MemberName="AuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsClient() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClient" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsClient ()" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClient : unit -&gt; unit&#xA;override this.AuthenticateAsClient : unit -&gt; unit" Usage="negotiateStream.AuthenticateAsClient " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsClient();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the client's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>, and mutual authentication is requested. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient (System.Net.NetworkCredential credential, string targetName);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsClient(class System.Net.NetworkCredential credential, string targetName) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.String)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsClient (credential As NetworkCredential, targetName As String)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClient : System.Net.NetworkCredential * string -&gt; unit&#xA;override this.AuthenticateAsClient : System.Net.NetworkCredential * string -&gt; unit" Usage="negotiateStream.AuthenticateAsClient (credential, targetName)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::String ^ targetName);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="targetName" Type="System.String" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified client credential.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>, and mutual authentication is requested. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 ]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is <see langword="null" />.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding? binding, string targetName);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsClient(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsClient (credential As NetworkCredential, binding As ChannelBinding, targetName As String)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string -&gt; unit&#xA;override this.AuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string -&gt; unit" Usage="negotiateStream.AuthenticateAsClient (credential, binding, targetName)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ChannelBinding ^ binding, System::String ^ targetName);" />
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="binding" Type="System.Security.Authentication.ExtendedProtection.ChannelBinding" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="targetName" Type="System.String" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="binding">The <see cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" /> that is used for extended protection.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified client credential and the channel binding.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>, and mutual authentication is requested. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 The <xref:System.Security.Authentication.ExtendedProtection.ChannelBinding> used for extended protection that is passed to this method in the `binding` parameter would be retrieved by an application from <xref:System.Net.Security.SslStream.TransportContext%2A> property on the associated <xref:System.Net.Security.SslStream>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is <see langword="null" />.

-or-

 <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient (System.Net.NetworkCredential credential, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsClient(class System.Net.NetworkCredential credential, string targetName, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsClient (credential As NetworkCredential, targetName As String, requiredProtectionLevel As ProtectionLevel, allowedImpersonationLevel As TokenImpersonationLevel)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClient : System.Net.NetworkCredential * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit&#xA;override this.AuthenticateAsClient : System.Net.NetworkCredential * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit" Usage="negotiateStream.AuthenticateAsClient (credential, targetName, requiredProtectionLevel, allowedImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::String ^ targetName, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel allowedImpersonationLevel);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="targetName" Type="System.String" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="allowedImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="allowedImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified credentials and authentication options.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="allowedImpersonationLevel" /> is not a valid value.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is null.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding? binding, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsClient(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsClient (credential As NetworkCredential, binding As ChannelBinding, targetName As String, requiredProtectionLevel As ProtectionLevel, allowedImpersonationLevel As TokenImpersonationLevel)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit&#xA;override this.AuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit" Usage="negotiateStream.AuthenticateAsClient (credential, binding, targetName, requiredProtectionLevel, allowedImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ChannelBinding ^ binding, System::String ^ targetName, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel allowedImpersonationLevel);" />
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="binding" Type="System.Security.Authentication.ExtendedProtection.ChannelBinding" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="targetName" Type="System.String" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="allowedImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="binding">The <see cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" /> that is used for extended protection.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="allowedImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified credential, authentication options, and channel binding.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 The <xref:System.Security.Authentication.ExtendedProtection.ChannelBinding> used for extended protection that is passed to this method in the `binding` parameter would be retrieved by an application from <xref:System.Net.Security.SslStream.TransportContext%2A> property on the associated <xref:System.Net.Security.SslStream>.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is <see langword="null" />.

-or-

 <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="allowedImpersonationLevel" /> is not a valid value.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
      </Docs>
    </Member>
    <MemberGroup MemberName="AuthenticateAsClientAsync">
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation.</summary>
      </Docs>
    </MemberGroup>
    <Member MemberName="AuthenticateAsClientAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsClientAsync() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsClientAsync () As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClientAsync : unit -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsClientAsync : unit -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsClientAsync " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsClientAsync();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the client's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>, and mutual authentication is requested. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient>.

]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClientAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync (System.Net.NetworkCredential credential, string targetName);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsClientAsync(class System.Net.NetworkCredential credential, string targetName) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync(System.Net.NetworkCredential,System.String)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsClientAsync (credential As NetworkCredential, targetName As String) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClientAsync : System.Net.NetworkCredential * string -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsClientAsync : System.Net.NetworkCredential * string -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsClientAsync (credential, targetName)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsClientAsync(System::Net::NetworkCredential ^ credential, System::String ^ targetName);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="targetName" Type="System.String" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified client credential.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>, and mutual authentication is requested. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.String)>.

]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is <see langword="null" />.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClientAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding? binding, string targetName);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsClientAsync(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsClientAsync (credential As NetworkCredential, binding As ChannelBinding, targetName As String) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClientAsync : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsClientAsync : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsClientAsync (credential, binding, targetName)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsClientAsync(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ChannelBinding ^ binding, System::String ^ targetName);" />
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName);" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="binding" Type="System.Security.Authentication.ExtendedProtection.ChannelBinding" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="targetName" Type="System.String" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="binding">The <see cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" /> that is used for extended protection.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified client credential and the channel binding.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>, and mutual authentication is requested. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 The <xref:System.Security.Authentication.ExtendedProtection.ChannelBinding> used for extended protection that is passed to this method in the `binding` parameter would be retrieved by an application from <xref:System.Net.Security.SslStream.TransportContext%2A> property on the associated <xref:System.Net.Security.SslStream>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is <see langword="null" />.

-or-

 <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClientAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync (System.Net.NetworkCredential credential, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsClientAsync(class System.Net.NetworkCredential credential, string targetName, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync(System.Net.NetworkCredential,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsClientAsync (credential As NetworkCredential, targetName As String, requiredProtectionLevel As ProtectionLevel, allowedImpersonationLevel As TokenImpersonationLevel) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClientAsync : System.Net.NetworkCredential * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsClientAsync : System.Net.NetworkCredential * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsClientAsync (credential, targetName, requiredProtectionLevel, allowedImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsClientAsync(System::Net::NetworkCredential ^ credential, System::String ^ targetName, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel allowedImpersonationLevel);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="targetName" Type="System.String" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="allowedImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="allowedImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified credentials and authentication options.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="allowedImpersonationLevel" /> is not a valid value.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is null.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsClientAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding? binding, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsClientAsync(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsClientAsync (credential As NetworkCredential, binding As ChannelBinding, targetName As String, requiredProtectionLevel As ProtectionLevel, allowedImpersonationLevel As TokenImpersonationLevel) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsClientAsync : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsClientAsync : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsClientAsync (credential, binding, targetName, requiredProtectionLevel, allowedImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsClientAsync(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ChannelBinding ^ binding, System::String ^ targetName, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel allowedImpersonationLevel);" />
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsClientAsync (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel);" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="binding" Type="System.Security.Authentication.ExtendedProtection.ChannelBinding" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="targetName" Type="System.String" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="allowedImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="binding">The <see cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" /> that is used for extended protection.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="allowedImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by clients to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified credential, authentication options, and channel binding.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 The <xref:System.Security.Authentication.ExtendedProtection.ChannelBinding> used for extended protection that is passed to this method in the `binding` parameter would be retrieved by an application from <xref:System.Net.Security.SslStream.TransportContext%2A> property on the associated <xref:System.Net.Security.SslStream>.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="targetName" /> is <see langword="null" />.

-or-

 <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="allowedImpersonationLevel" /> is not a valid value.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
      </Docs>
    </Member>
    <MemberGroup MemberName="AuthenticateAsServer">
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Handles the server side of an authentication for a client-server connection.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 These methods block while the authentication is in progress. To prevent the application from blocking while waiting for the authentication to complete, use the <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> method.

 ]]></format>
        </remarks>
      </Docs>
    </MemberGroup>
    <Member MemberName="AuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsServer ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsServer() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServer" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsServer ()" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServer : unit -&gt; unit&#xA;override this.AuthenticateAsServer : unit -&gt; unit" Usage="negotiateStream.AuthenticateAsServer " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsServer();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the server's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, and the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 This method blocks until the operation completes. To prevent blocking until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> method overloads.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsServer (System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy? policy);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsServer(class System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServer(System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsServer (policy As ExtendedProtectionPolicy)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServer : System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy -&gt; unit&#xA;override this.AuthenticateAsServer : System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy -&gt; unit" Usage="negotiateStream.AuthenticateAsServer policy" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsServer(System::Security::Authentication::ExtendedProtection::ExtendedProtectionPolicy ^ policy);" />
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsServer (System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="policy" Type="System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="policy">The <see cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" /> that is used for extended protection.</param>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified extended protection policy.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the server's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, and the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>.

 If the `policy` parameter is `null`, then an extended protection policy is used that has <xref:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.PolicyEnforcement%2A> set to <xref:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Never>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 This method blocks until the operation completes. To prevent blocking until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> method overloads.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentException">The <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomChannelBinding" /> and <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomServiceNames" /> on the extended protection policy passed in the <paramref name="policy" /> parameter are both <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.PlatformNotSupportedException">The <paramref name="policy" /> parameter was set to <see cref="F:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Always" /> on a platform that does not support extended protection.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsServer (System.Net.NetworkCredential credential, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsServer(class System.Net.NetworkCredential credential, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServer(System.Net.NetworkCredential,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsServer (credential As NetworkCredential, requiredProtectionLevel As ProtectionLevel, requiredImpersonationLevel As TokenImpersonationLevel)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServer : System.Net.NetworkCredential * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit&#xA;override this.AuthenticateAsServer : System.Net.NetworkCredential * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit" Usage="negotiateStream.AuthenticateAsServer (credential, requiredProtectionLevel, requiredImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsServer(System::Net::NetworkCredential ^ credential, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel requiredImpersonationLevel);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the server.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="requiredImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified server credentials and authentication options.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 This method blocks until the operation completes. To prevent blocking until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> method overloads.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="requiredImpersonationLevel" /> must be <see cref="F:System.Security.Principal.TokenImpersonationLevel.Identification" />, <see cref="F:System.Security.Principal.TokenImpersonationLevel.Impersonation" />, or <see cref="F:System.Security.Principal.TokenImpersonationLevel.Delegation" />,</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to try to r-authenticate.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the client. You cannot use the stream to retry authentication as the server.</exception>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsServer (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy? policy, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void AuthenticateAsServer(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServer(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub AuthenticateAsServer (credential As NetworkCredential, policy As ExtendedProtectionPolicy, requiredProtectionLevel As ProtectionLevel, requiredImpersonationLevel As TokenImpersonationLevel)" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServer : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit&#xA;override this.AuthenticateAsServer : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; unit" Usage="negotiateStream.AuthenticateAsServer (credential, policy, requiredProtectionLevel, requiredImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void AuthenticateAsServer(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ExtendedProtectionPolicy ^ policy, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel requiredImpersonationLevel);" />
      <MemberSignature Language="C#" Value="public virtual void AuthenticateAsServer (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="policy" Type="System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="policy">The <see cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" /> that is used for extended protection.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="requiredImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified server credentials, authentication options, and extended protection policy.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If the `policy` parameter is `null`, then an extended protection policy is used that has <xref:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.PolicyEnforcement%2A> set to <xref:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Never>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 This method blocks until the operation completes. To prevent blocking until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> method overloads.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentException">The <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomChannelBinding" /> and <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomServiceNames" /> on the extended protection policy passed in the <paramref name="policy" /> parameter are both <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="requiredImpersonationLevel" /> must be <see cref="F:System.Security.Principal.TokenImpersonationLevel.Identification" />, <see cref="F:System.Security.Principal.TokenImpersonationLevel.Impersonation" />, or <see cref="F:System.Security.Principal.TokenImpersonationLevel.Delegation" />,</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to try to r-authenticate.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the client. You cannot use the stream to retry authentication as the server.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.PlatformNotSupportedException">The <paramref name="policy" /> parameter was set to <see cref="F:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Always" /> on a platform that does not support extended protection.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <MemberGroup MemberName="AuthenticateAsServerAsync">
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Handles the server side of an authentication for a client-server connection as an asynchronous operation.</summary>
      </Docs>
    </MemberGroup>
    <Member MemberName="AuthenticateAsServerAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsServerAsync() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsServerAsync () As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServerAsync : unit -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsServerAsync : unit -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsServerAsync " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsServerAsync();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the server's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, and the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer>.

]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsServerAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync (System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy? policy);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsServerAsync(class System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync(System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsServerAsync (policy As ExtendedProtectionPolicy) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServerAsync : System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsServerAsync : System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsServerAsync policy" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsServerAsync(System::Security::Authentication::ExtendedProtection::ExtendedProtectionPolicy ^ policy);" />
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync (System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy);" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="policy" Type="System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="policy">The <see cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" /> that is used for extended protection.</param>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified extended protection policy.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the server's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, and the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>.

 If the `policy` parameter is `null`, then an extended protection policy is used that has <xref:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.PolicyEnforcement%2A> set to <xref:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Never>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer(System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentException">The <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomChannelBinding" /> and <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomServiceNames" /> on the extended protection policy passed in the <paramref name="policy" /> parameter are both <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.PlatformNotSupportedException">The <paramref name="policy" /> parameter was set to <see cref="F:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Always" /> on a platform that does not support extended protection.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsServerAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync (System.Net.NetworkCredential credential, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsServerAsync(class System.Net.NetworkCredential credential, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync(System.Net.NetworkCredential,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsServerAsync (credential As NetworkCredential, requiredProtectionLevel As ProtectionLevel, requiredImpersonationLevel As TokenImpersonationLevel) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServerAsync : System.Net.NetworkCredential * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsServerAsync : System.Net.NetworkCredential * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsServerAsync (credential, requiredProtectionLevel, requiredImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsServerAsync(System::Net::NetworkCredential ^ credential, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel requiredImpersonationLevel);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the server.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="requiredImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified server credentials and authentication options.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer(System.Net.NetworkCredential,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="requiredImpersonationLevel" /> must be <see cref="F:System.Security.Principal.TokenImpersonationLevel.Identification" />, <see cref="F:System.Security.Principal.TokenImpersonationLevel.Impersonation" />, or <see cref="F:System.Security.Principal.TokenImpersonationLevel.Delegation" />,</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to try to r-authenticate.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the client. You cannot use the stream to retry authentication as the server.</exception>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="AuthenticateAsServerAsync">
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy? policy, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Threading.Tasks.Task AuthenticateAsServerAsync(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function AuthenticateAsServerAsync (credential As NetworkCredential, policy As ExtendedProtectionPolicy, requiredProtectionLevel As ProtectionLevel, requiredImpersonationLevel As TokenImpersonationLevel) As Task" />
      <MemberSignature Language="F#" Value="abstract member AuthenticateAsServerAsync : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task&#xA;override this.AuthenticateAsServerAsync : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.AuthenticateAsServerAsync (credential, policy, requiredProtectionLevel, requiredImpersonationLevel)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual System::Threading::Tasks::Task ^ AuthenticateAsServerAsync(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ExtendedProtectionPolicy ^ policy, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel requiredImpersonationLevel);" />
      <MemberSignature Language="C#" Value="public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel);" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="policy" Type="System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="policy">The <see cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" /> that is used for extended protection.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="requiredImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <summary>Called by servers to authenticate the client, and optionally the server, in a client-server connection as an asynchronous operation. The authentication process uses the specified server credentials, authentication options, and extended protection policy.</summary>
        <returns>The task object representing the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If the `policy` parameter is `null`, then an extended protection policy is used that has <xref:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.PolicyEnforcement%2A> set to <xref:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Never>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentException">The <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomChannelBinding" /> and <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomServiceNames" /> on the extended protection policy passed in the <paramref name="policy" /> parameter are both <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="requiredImpersonationLevel" /> must be <see cref="F:System.Security.Principal.TokenImpersonationLevel.Identification" />, <see cref="F:System.Security.Principal.TokenImpersonationLevel.Impersonation" />, or <see cref="F:System.Security.Principal.TokenImpersonationLevel.Delegation" />,</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to try to r-authenticate.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the client. You cannot use the stream to retry authentication as the server.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.PlatformNotSupportedException">The <paramref name="policy" /> parameter was set to <see cref="F:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Always" /> on a platform that does not support extended protection.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <MemberGroup MemberName="BeginAuthenticateAsClient">
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Begins an asynchronous operation to authenticate the client side of a client-server connection.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The overloads of this method do not block while authentication is in progress. To block while waiting for the authentication to complete, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> methods.

 ]]></format>
        </remarks>
      </Docs>
    </MemberGroup>
    <Member MemberName="BeginAuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsClient(class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient(System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsClient (asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsClient : AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsClient : AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsClient (asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsClient(AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
        <Attributes>
          <Attribute FrameworkAlternate="net-10.0">
            <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
            <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(1)&gt;]</AttributeName>
          </Attribute>
        </Attributes>
      </ReturnValue>
      <Parameters>
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncState" Type="System.Object" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by clients to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the client's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, and the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>. The <xref:System.Net.Security.NegotiateStream> class will construct the SPN used for mutual authentication.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsClient%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

## Examples

The following example demonstrates calling this method to begin an asynchronous authentication for the client.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/AuthenticatedStream/Overview/client.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/System.Net.Security/AuthenticatedStream/Overview/client.vb" id="Snippet2":::

 ]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, string targetName, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsClient(class System.Net.NetworkCredential credential, string targetName, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient(System.Net.NetworkCredential,System.String,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsClient (credential As NetworkCredential, targetName As String, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsClient : System.Net.NetworkCredential * string * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsClient : System.Net.NetworkCredential * string * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsClient (credential, targetName, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::String ^ targetName, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, string targetName, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="targetName" Type="System.String" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by clients to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified credentials. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsClient%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.

-or-

 <paramref name="targetName" /> is <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding? binding, string targetName, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsClient(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsClient (credential As NetworkCredential, binding As ChannelBinding, targetName As String, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsClient (credential, binding, targetName, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ChannelBinding ^ binding, System::String ^ targetName, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="binding" Type="System.Security.Authentication.ExtendedProtection.ChannelBinding" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="targetName" Type="System.String" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="binding">The <see cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" /> that is used for extended protection.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by clients to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified credentials and channel binding. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsClient%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.

-or-

 <paramref name="targetName" /> is <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsClient(class System.Net.NetworkCredential credential, string targetName, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient(System.Net.NetworkCredential,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsClient (credential As NetworkCredential, targetName As String, requiredProtectionLevel As ProtectionLevel, allowedImpersonationLevel As TokenImpersonationLevel, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsClient : System.Net.NetworkCredential * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsClient : System.Net.NetworkCredential * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsClient (credential, targetName, requiredProtectionLevel, allowedImpersonationLevel, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::String ^ targetName, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel allowedImpersonationLevel, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="targetName" Type="System.String" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="allowedImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="5" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="allowedImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by clients to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified credentials and authentication options. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsClient%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.

-or-

 <paramref name="targetName" /> is <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding? binding, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsClient(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ChannelBinding,System.String,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsClient (credential As NetworkCredential, binding As ChannelBinding, targetName As String, requiredProtectionLevel As ProtectionLevel, allowedImpersonationLevel As TokenImpersonationLevel, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsClient : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ChannelBinding * string * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsClient (credential, binding, targetName, requiredProtectionLevel, allowedImpersonationLevel, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsClient(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ChannelBinding ^ binding, System::String ^ targetName, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel allowedImpersonationLevel, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsClient (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ChannelBinding binding, string targetName, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel allowedImpersonationLevel, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="binding" Type="System.Security.Authentication.ExtendedProtection.ChannelBinding" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="targetName" Type="System.String" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="allowedImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="5" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="6" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="binding">The <see cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" /> that is used for extended protection.</param>
        <param name="targetName">The Service Principal Name (SPN) that uniquely identifies the server to authenticate.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="allowedImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by clients to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified credentials, authentication options, and channel binding. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsClient%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.

-or-

 <paramref name="targetName" /> is <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ChannelBinding" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
      </Docs>
    </Member>
    <MemberGroup MemberName="BeginAuthenticateAsServer">
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Docs>
        <summary>Begins an asynchronous operation to handle the server side of authenticating a client-server connection.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The overloads of this method do not block while the authentication is in progress. To block while waiting for the authentication to complete, use the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> method.

 ]]></format>
        </remarks>
      </Docs>
    </MemberGroup>
    <Member MemberName="BeginAuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsServer(class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer(System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsServer (asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsServer : AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsServer : AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsServer (asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsServer(AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
        <Attributes>
          <Attribute FrameworkAlternate="net-10.0">
            <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
            <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(1)&gt;]</AttributeName>
          </Attribute>
        </Attributes>
      </ReturnValue>
      <Parameters>
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncState" Type="System.Object" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by servers to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the server's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> method overloads.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy? policy, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsServer(class System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer(System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsServer (policy As ExtendedProtectionPolicy, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsServer : System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsServer : System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsServer (policy, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsServer(System::Security::Authentication::ExtendedProtection::ExtendedProtectionPolicy ^ policy, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
        <Attributes>
          <Attribute FrameworkAlternate="net-10.0">
            <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
            <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(1)&gt;]</AttributeName>
          </Attribute>
        </Attributes>
      </ReturnValue>
      <Parameters>
        <Parameter Name="policy" Type="System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncState" Type="System.Object" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="policy">The <see cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" /> that is used for extended protection.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by servers to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified extended protection policy. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The authentication uses the server's <xref:System.Net.CredentialCache.DefaultCredentials%2A>. No Service Principal Name (SPN) is specified for the server. The impersonation level is <xref:System.Security.Principal.TokenImpersonationLevel.Identification>, the security level is <xref:System.Net.Security.ProtectionLevel.EncryptAndSign>.

 If the `policy` parameter is `null`, then an extended protection policy is used that has <xref:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.PolicyEnforcement%2A> set to <xref:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Never>.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> method overloads.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentException">The <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomChannelBinding" /> and <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomServiceNames" /> on the extended protection policy passed in the <paramref name="policy" /> parameter are both <see langword="null" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.PlatformNotSupportedException">The <paramref name="policy" /> parameter was set to <see cref="F:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Always" /> on a platform that does not support extended protection.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (System.Net.NetworkCredential credential, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsServer(class System.Net.NetworkCredential credential, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer(System.Net.NetworkCredential,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsServer (credential As NetworkCredential, requiredProtectionLevel As ProtectionLevel, requiredImpersonationLevel As TokenImpersonationLevel, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsServer : System.Net.NetworkCredential * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsServer : System.Net.NetworkCredential * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsServer (credential, requiredProtectionLevel, requiredImpersonationLevel, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsServer(System::Net::NetworkCredential ^ credential, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel requiredImpersonationLevel, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (System.Net.NetworkCredential credential, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="netframework-4.0">
          <AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="requiredImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by servers to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified server credentials and authentication options. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that, the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsServer%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="requiredImpersonationLevel" /> must be <see cref="F:System.Security.Principal.TokenImpersonationLevel.Identification" />, <see cref="F:System.Security.Principal.TokenImpersonationLevel.Impersonation" />, or <see cref="F:System.Security.Principal.TokenImpersonationLevel.Delegation" />,</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the client. You cannot use the stream to retry authentication as the server.</exception>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginAuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy? policy, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.IAsyncResult BeginAuthenticateAsServer(class System.Net.NetworkCredential credential, class System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, valuetype System.Net.Security.ProtectionLevel requiredProtectionLevel, valuetype System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer(System.Net.NetworkCredential,System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy,System.Net.Security.ProtectionLevel,System.Security.Principal.TokenImpersonationLevel,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Function BeginAuthenticateAsServer (credential As NetworkCredential, policy As ExtendedProtectionPolicy, requiredProtectionLevel As ProtectionLevel, requiredImpersonationLevel As TokenImpersonationLevel, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="abstract member BeginAuthenticateAsServer : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult&#xA;override this.BeginAuthenticateAsServer : System.Net.NetworkCredential * System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy * System.Net.Security.ProtectionLevel * System.Security.Principal.TokenImpersonationLevel * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginAuthenticateAsServer (credential, policy, requiredProtectionLevel, requiredImpersonationLevel, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual IAsyncResult ^ BeginAuthenticateAsServer(System::Net::NetworkCredential ^ credential, System::Security::Authentication::ExtendedProtection::ExtendedProtectionPolicy ^ policy, System::Net::Security::ProtectionLevel requiredProtectionLevel, System::Security::Principal::TokenImpersonationLevel requiredImpersonationLevel, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public virtual IAsyncResult BeginAuthenticateAsServer (System.Net.NetworkCredential credential, System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy policy, System.Net.Security.ProtectionLevel requiredProtectionLevel, System.Security.Principal.TokenImpersonationLevel requiredImpersonationLevel, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
        <Attributes>
          <Attribute FrameworkAlternate="net-10.0">
            <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
            <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(1)&gt;]</AttributeName>
          </Attribute>
        </Attributes>
      </ReturnValue>
      <Parameters>
        <Parameter Name="credential" Type="System.Net.NetworkCredential" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(1)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="policy" Type="System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredProtectionLevel" Type="System.Net.Security.ProtectionLevel" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="requiredImpersonationLevel" Type="System.Security.Principal.TokenImpersonationLevel" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncState" Type="System.Object" Index="5" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="credential">The <see cref="T:System.Net.NetworkCredential" /> that is used to establish the identity of the client.</param>
        <param name="policy">The <see cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" /> that is used for extended protection.</param>
        <param name="requiredProtectionLevel">One of the <see cref="T:System.Net.Security.ProtectionLevel" /> values, indicating the security services for the stream.</param>
        <param name="requiredImpersonationLevel">One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values, indicating how the server can use the client's credentials to access resources.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the authentication is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Called by servers to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified server credentials, authentication options, and extended protection policy. This method does not block.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Use the `requiredProtectionLevel` parameter to request security services for data transmitted using the authenticated stream. For example, to have the data encrypted and signed, specify the <xref:System.Net.Security.ProtectionLevel.EncryptAndSign> value. Successful authentication does not guarantee that, the requested <xref:System.Net.Security.ProtectionLevel> has been granted. You must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>.

 If the `policy` parameter is `null`, then an extended protection policy is used that has <xref:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.PolicyEnforcement%2A> set to <xref:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Never>.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> method overloads.

 The asynchronous authentication operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndAuthenticateAsServer%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentException">The <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomChannelBinding" /> and <see cref="P:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy.CustomServiceNames" /> on the extended protection policy passed in the <paramref name="policy" /> parameter are both <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="credential" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="requiredImpersonationLevel" /> must be <see cref="F:System.Security.Principal.TokenImpersonationLevel.Identification" />, <see cref="F:System.Security.Principal.TokenImpersonationLevel.Impersonation" />, or <see cref="F:System.Security.Principal.TokenImpersonationLevel.Delegation" />,</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.

-or-

 This stream was used previously to attempt authentication as the client. You cannot use the stream to retry authentication as the server.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.PlatformNotSupportedException">The <paramref name="policy" /> parameter was set to <see cref="F:System.Security.Authentication.ExtendedProtection.PolicyEnforcement.Always" /> on a platform that does not support extended protection.</exception>
        <altmember cref="T:System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy" />
        <related type="Article" href="/dotnet/framework/network-programming/integrated-windows-authentication-with-extended-protection">Integrated Windows Authentication with Extended Protection</related>
        <exception cref="T:System.NotSupportedException">Windows 95 and Windows 98 are not supported.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginRead">
      <MemberSignature Language="C#" Value="public override IAsyncResult BeginRead (byte[] buffer, int offset, int count, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance class System.IAsyncResult BeginRead(unsigned int8[] buffer, int32 offset, int32 count, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginRead(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function BeginRead (buffer As Byte(), offset As Integer, count As Integer, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="override this.BeginRead : byte[] * int * int * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginRead (buffer, offset, count, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override IAsyncResult ^ BeginRead(cli::array &lt;System::Byte&gt; ^ buffer, int offset, int count, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public override IAsyncResult BeginRead (byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Byte[]" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="offset" Type="System.Int32" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="count" Type="System.Int32" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="buffer">A <see cref="T:System.Byte" /> array that receives the bytes read from the stream.</param>
        <param name="offset">The zero-based location in <paramref name="buffer" /> at which to begin storing the data read from this stream.</param>
        <param name="count">The maximum number of bytes to read from the stream.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the read operation is complete.</param>
        <param name="asyncState">A user-defined object containing information about the read operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Begins an asynchronous read operation that reads data from the stream and stores it in the specified array.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If encryption, signing, or encryption and signing are enabled, the read operation reads the data from the underlying stream, checks the integrity of the data, and decrypts it. If no security services such as data encryption or signing are in use, this method starts an asynchronous read operation on the underlying stream.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use the <xref:System.Net.Security.NegotiateStream.Read%2A> method.

 The asynchronous read operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndRead%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 The <xref:System.Net.Security.NegotiateStream> class does not support multiple simultaneous read operations. If you attempt to start a read operation while another read operation is already executing on the same stream, a <xref:System.NotSupportedException> exception will be thrown.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

## Examples

 The following code example demonstrates starting an asynchronous read operation. This code example is part of a larger example provided for the <xref:System.Net.Security.NegotiateStream> class.

 :::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/Overview/server.cs" id="Snippet1":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="buffer" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="offset" /> is less than 0.

-or-

 <paramref name="offset" /> is greater than the length of <paramref name="buffer" />.

-or-

 <paramref name="offset" /> plus <paramref name="count" /> is greater than the length of <paramref name="buffer" />.</exception>
        <exception cref="T:System.IO.IOException">The read operation failed.

-or-

 Encryption is in use, but the data could not be decrypted.</exception>
        <exception cref="T:System.NotSupportedException">There is already a read operation in progress.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
      </Docs>
    </Member>
    <Member MemberName="BeginWrite">
      <MemberSignature Language="C#" Value="public override IAsyncResult BeginWrite (byte[] buffer, int offset, int count, AsyncCallback? asyncCallback, object? asyncState);" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance class System.IAsyncResult BeginWrite(unsigned int8[] buffer, int32 offset, int32 count, class System.AsyncCallback asyncCallback, object asyncState) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.BeginWrite(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function BeginWrite (buffer As Byte(), offset As Integer, count As Integer, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult" />
      <MemberSignature Language="F#" Value="override this.BeginWrite : byte[] * int * int * AsyncCallback * obj -&gt; IAsyncResult" Usage="negotiateStream.BeginWrite (buffer, offset, count, asyncCallback, asyncState)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override IAsyncResult ^ BeginWrite(cli::array &lt;System::Byte&gt; ^ buffer, int offset, int count, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);" />
      <MemberSignature Language="C#" Value="public override IAsyncResult BeginWrite (byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.IAsyncResult</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Byte[]" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="offset" Type="System.Int32" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="count" Type="System.Int32" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
        <Parameter Name="asyncCallback" Type="System.AsyncCallback" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
        <Parameter Name="asyncState" Type="System.Object" Index="4" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="buffer">A <see cref="T:System.Byte" /> array that supplies the bytes to be written to the stream.</param>
        <param name="offset">The zero-based location in <paramref name="buffer" /> at which to begin reading bytes to be written to the stream.</param>
        <param name="count">An <see cref="T:System.Int32" /> value that specifies the number of bytes to read from <paramref name="buffer" />.</param>
        <param name="asyncCallback">An <see cref="T:System.AsyncCallback" /> delegate that references the method to invoke when the write operation is complete.</param>
        <param name="asyncState">A user-defined object containing information about the write operation. This object is passed to the <paramref name="asyncCallback" /> delegate when the operation completes.</param>
        <summary>Begins an asynchronous write operation that writes <see cref="T:System.Byte" />s from the specified buffer to the stream.</summary>
        <returns>An <see cref="T:System.IAsyncResult" /> object indicating the status of the asynchronous operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If encryption, signing, or encryption and signing are enabled, this method reads the data from buffer, encrypts, signs, or encrypts and signs it, and transmits it using the underlying stream. If no security services such as data encryption or signing are in use, this method starts an asynchronous write operation on the underlying stream.

 This method is asynchronous and does not block while the operation completes. To block until the operation completes, use the <xref:System.Net.Security.NegotiateStream.Read%2A> method.

 The asynchronous read operation must be completed by calling the <xref:System.Net.Security.NegotiateStream.EndWrite%2A> method. Typically, the method is invoked by the `asyncCallback` delegate. For detailed information about using the asynchronous programming model, see [Calling Synchronous Methods Asynchronously](/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously)

 The <xref:System.Net.Security.NegotiateStream> class does not support multiple simultaneous write operations. If you attempt to start a write operation while another write operation is already executing on the same stream, a <xref:System.NotSupportedException> exception will be thrown.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

## Examples

The following example demonstrates beginning an asynchronous write operation.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/AuthenticatedStream/Overview/client.cs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/System.Net.Security/AuthenticatedStream/Overview/client.vb" id="Snippet3":::

The following method is called when the operation completes.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/AuthenticatedStream/Overview/client.cs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/System.Net.Security/AuthenticatedStream/Overview/client.vb" id="Snippet4":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="buffer" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="offset" /> is less than 0.

-or-

 <paramref name="offset" /> is greater than the length of <paramref name="buffer" />.

-or-

 <paramref name="offset" /> plus count is greater than the length of <paramref name="buffer" />.</exception>
        <exception cref="T:System.IO.IOException">The write operation failed.

-or-

 Encryption is in use, but the data could not be encrypted.</exception>
        <exception cref="T:System.NotSupportedException">There is already a write operation in progress.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
      </Docs>
    </Member>
    <Member MemberName="CanRead">
      <MemberSignature Language="C#" Value="public override bool CanRead { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool CanRead" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.CanRead" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property CanRead As Boolean" />
      <MemberSignature Language="F#" Value="member this.CanRead : bool" Usage="System.Net.Security.NegotiateStream.CanRead" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool CanRead { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether the underlying stream is readable.</summary>
        <value>
          <see langword="true" /> if authentication has occurred and the underlying stream is readable; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If successful authentication has occurred, this property returns the value returned by invoking the <xref:System.IO.Stream.CanRead%2A> property on the underlying stream. The underlying stream is specified when you create an instance of the <xref:System.Net.Security.NegotiateStream> class.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="CanSeek">
      <MemberSignature Language="C#" Value="public override bool CanSeek { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool CanSeek" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.CanSeek" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property CanSeek As Boolean" />
      <MemberSignature Language="F#" Value="member this.CanSeek : bool" Usage="System.Net.Security.NegotiateStream.CanSeek" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool CanSeek { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether the underlying stream is seekable.</summary>
        <value>This property always returns <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 You should not attempt to set the position of the <xref:System.Net.Security.NegotiateStream> object or its underlying stream. The underlying stream is specified when you create an instance of the <xref:System.Net.Security.NegotiateStream> class.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
        <altmember cref="P:System.Net.Security.NegotiateStream.Position" />
      </Docs>
    </Member>
    <Member MemberName="CanTimeout">
      <MemberSignature Language="C#" Value="public override bool CanTimeout { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool CanTimeout" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.CanTimeout" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property CanTimeout As Boolean" />
      <MemberSignature Language="F#" Value="member this.CanTimeout : bool" Usage="System.Net.Security.NegotiateStream.CanTimeout" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool CanTimeout { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether the underlying stream supports time-outs.</summary>
        <value>
          <see langword="true" /> if the underlying stream supports time-outs; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property returns the value returned by invoking the <xref:System.IO.Stream.CanTimeout%2A> property on the underlying stream. The underlying stream is specified when you create an instance of the <xref:System.Net.Security.NegotiateStream> class.



## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="CanWrite">
      <MemberSignature Language="C#" Value="public override bool CanWrite { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool CanWrite" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.CanWrite" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property CanWrite As Boolean" />
      <MemberSignature Language="F#" Value="member this.CanWrite : bool" Usage="System.Net.Security.NegotiateStream.CanWrite" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool CanWrite { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether the underlying stream is writable.</summary>
        <value>
          <see langword="true" /> if authentication has occurred and the underlying stream is writable; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If successful authentication has occurred, this property returns the value returned by invoking the <xref:System.IO.Stream.CanWrite%2A> property on the underlying stream. The underlying stream is specified when you create an instance of the <xref:System.Net.Security.NegotiateStream> class.



## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="Dispose">
      <MemberSignature Language="C#" Value="protected override void Dispose (bool disposing);" />
      <MemberSignature Language="ILAsm" Value=".method familyhidebysig virtual instance void Dispose(bool disposing) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.Dispose(System.Boolean)" />
      <MemberSignature Language="VB.NET" Value="Protected Overrides Sub Dispose (disposing As Boolean)" />
      <MemberSignature Language="F#" Value="override this.Dispose : bool -&gt; unit" Usage="negotiateStream.Dispose disposing" />
      <MemberSignature Language="C++ CLI" Value="protected:&#xA; override void Dispose(bool disposing);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="disposing" Type="System.Boolean" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="disposing">
          <see langword="true" /> to release both managed and unmanaged resources; <see langword="false" /> to release only unmanaged resources.</param>
        <summary>Releases the unmanaged resources used by the <see cref="T:System.Net.Security.NegotiateStream" /> and optionally releases the managed resources.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method is called by the public `Dispose()` method and the <xref:System.Object.Finalize> method, if it has been overridden. `Dispose()` invokes this method with the `disposing` parameter set to `true`. `Finalize` invokes this method with `disposing` set to `false`.

 When the `disposing` parameter is true, this method releases all resources held by any managed objects that this <xref:System.Net.Security.NegotiateStream> references. This method invokes the `Dispose()` method of each referenced object.

 ]]></format>
        </remarks>
        <block subset="none" type="overrides">
          <para>
            <see langword="Dispose" /> can be called multiple times by other objects. When overriding <see langword="Dispose(Boolean)" /> be careful not to reference objects that have been previously disposed of in an earlier call to <see langword="Dispose" />. For more information about how to implement <see langword="Dispose(Boolean)" />, see <see href="/dotnet/standard/garbage-collection/implementing-dispose">Implementing a Dispose Method</see>.

 For more information about <see langword="Dispose" /> and <see cref="M:System.Object.Finalize" />, see <see href="/dotnet/standard/garbage-collection/unmanaged">Cleaning Up Unmanaged Resources</see> and <see href="https://learn.microsoft.com/previous-versions/dotnet/netframework-4.0/ddae83kx(v=vs.100)">Overriding the Finalize Method</see>.</para>
        </block>
      </Docs>
    </Member>
    <Member MemberName="DisposeAsync">
      <MemberSignature Language="C#" Value="public override System.Threading.Tasks.ValueTask DisposeAsync ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance valuetype System.Threading.Tasks.ValueTask DisposeAsync() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.DisposeAsync" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function DisposeAsync () As ValueTask" />
      <MemberSignature Language="F#" Value="override this.DisposeAsync : unit -&gt; System.Threading.Tasks.ValueTask" Usage="negotiateStream.DisposeAsync " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override System::Threading::Tasks::ValueTask DisposeAsync();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.ValueTask</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Asynchronously releases the unmanaged and managed resources used by the <see cref="T:System.Net.Security.NegotiateStream" />.</summary>
        <returns>A task that represents the asynchronous dispose operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method enables you to perform a resource-intensive dispose operation without blocking the main thread.

 This method also disposes the inner stream when <xref:System.Net.Security.AuthenticatedStream.LeaveInnerStreamOpen> is `false`; otherwise, the inner stream is just flushed.

 Calling `DisposeAsync` allows the resources used by the <xref:System.Net.Security.NegotiateStream> to be reallocated for other purposes. For more information, see [Cleaning Up Unmanaged Resources](/dotnet/standard/garbage-collection/unmanaged).

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="EndAuthenticateAsClient">
      <MemberSignature Language="C#" Value="public virtual void EndAuthenticateAsClient (IAsyncResult asyncResult);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void EndAuthenticateAsClient(class System.IAsyncResult asyncResult) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.EndAuthenticateAsClient(System.IAsyncResult)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub EndAuthenticateAsClient (asyncResult As IAsyncResult)" />
      <MemberSignature Language="F#" Value="abstract member EndAuthenticateAsClient : IAsyncResult -&gt; unit&#xA;override this.EndAuthenticateAsClient : IAsyncResult -&gt; unit" Usage="negotiateStream.EndAuthenticateAsClient asyncResult" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void EndAuthenticateAsClient(IAsyncResult ^ asyncResult);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="asyncResult" Type="System.IAsyncResult" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="asyncResult">An <see cref="T:System.IAsyncResult" /> instance returned by a call to <see cref="Overload:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient" />.</param>
        <summary>Ends a pending asynchronous client authentication operation that was started with a call to <see cref="Overload:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient" />.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If the operation has not completed, this method blocks until it does. When the authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 To perform this operation synchronously, use one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> method.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="asyncResult" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="asyncResult" /> was not created by a call to <see cref="Overload:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">There is no pending client authentication to complete.</exception>
      </Docs>
    </Member>
    <Member MemberName="EndAuthenticateAsServer">
      <MemberSignature Language="C#" Value="public virtual void EndAuthenticateAsServer (IAsyncResult asyncResult);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void EndAuthenticateAsServer(class System.IAsyncResult asyncResult) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.EndAuthenticateAsServer(System.IAsyncResult)" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Sub EndAuthenticateAsServer (asyncResult As IAsyncResult)" />
      <MemberSignature Language="F#" Value="abstract member EndAuthenticateAsServer : IAsyncResult -&gt; unit&#xA;override this.EndAuthenticateAsServer : IAsyncResult -&gt; unit" Usage="negotiateStream.EndAuthenticateAsServer asyncResult" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual void EndAuthenticateAsServer(IAsyncResult ^ asyncResult);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="asyncResult" Type="System.IAsyncResult" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="asyncResult">An <see cref="T:System.IAsyncResult" /> instance returned by a call to <see cref="Overload:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer" />.</param>
        <summary>Ends a pending asynchronous client authentication operation that was started with a call to <see cref="Overload:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer" />.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If the operation has not completed, this method blocks until it does.

 When authentication succeeds, you must check the <xref:System.Net.Security.NegotiateStream.IsEncrypted%2A> and <xref:System.Net.Security.NegotiateStream.IsSigned%2A> properties to determine what security services are used by the <xref:System.Net.Security.NegotiateStream>. Check the <xref:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated%2A> property to determine whether mutual authentication occurred.

 If the authentication fails, you receive an <xref:System.Security.Authentication.AuthenticationException> or an <xref:System.Security.Authentication.InvalidCredentialException>. In this case, you can retry the authentication with a different credential.

 To perform this operation synchronously, use the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> method.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="asyncResult" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="asyncResult" /> was not created by a call to <see cref="Overload:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer" />.</exception>
        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.Security.Authentication.InvalidCredentialException">The authentication failed. You can use this object to retry the authentication.</exception>
        <exception cref="T:System.InvalidOperationException">There is no pending authentication to complete.</exception>
      </Docs>
    </Member>
    <Member MemberName="EndRead">
      <MemberSignature Language="C#" Value="public override int EndRead (IAsyncResult asyncResult);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance int32 EndRead(class System.IAsyncResult asyncResult) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.EndRead(System.IAsyncResult)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function EndRead (asyncResult As IAsyncResult) As Integer" />
      <MemberSignature Language="F#" Value="override this.EndRead : IAsyncResult -&gt; int" Usage="negotiateStream.EndRead asyncResult" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override int EndRead(IAsyncResult ^ asyncResult);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int32</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="asyncResult" Type="System.IAsyncResult" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="asyncResult">An <see cref="T:System.IAsyncResult" /> instance returned by a call to <see cref="M:System.Net.Security.NegotiateStream.BeginRead(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />.</param>
        <summary>Ends an asynchronous read operation that was started with a call to <see cref="M:System.Net.Security.NegotiateStream.BeginRead(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />.</summary>
        <returns>A <see cref="T:System.Int32" /> value that specifies the number of bytes read from the underlying stream.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If the operation has not completed, this method blocks until it does.

 To perform this operation synchronously, use the <xref:System.Net.Security.NegotiateStream.Read%2A> method.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

## Examples

The following code example demonstrates ending an asynchronous read operation. For an example that demonstrates starting the operation, see <xref:System.Net.Security.NegotiateStream.BeginRead%2A>.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/Overview/server.cs" id="Snippet3":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="asyncResult" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">The asyncResult was not created by a call to <see cref="M:System.Net.Security.NegotiateStream.BeginRead(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />.</exception>
        <exception cref="T:System.InvalidOperationException">There is no pending read operation to complete.

-or-

Authentication has not occurred.</exception>
        <exception cref="T:System.IO.IOException">The read operation failed.</exception>
      </Docs>
    </Member>
    <Member MemberName="EndWrite">
      <MemberSignature Language="C#" Value="public override void EndWrite (IAsyncResult asyncResult);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance void EndWrite(class System.IAsyncResult asyncResult) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.EndWrite(System.IAsyncResult)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Sub EndWrite (asyncResult As IAsyncResult)" />
      <MemberSignature Language="F#" Value="override this.EndWrite : IAsyncResult -&gt; unit" Usage="negotiateStream.EndWrite asyncResult" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override void EndWrite(IAsyncResult ^ asyncResult);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="asyncResult" Type="System.IAsyncResult" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="asyncResult">An <see cref="T:System.IAsyncResult" /> instance returned by a call to <see cref="M:System.Net.Security.NegotiateStream.BeginWrite(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />.</param>
        <summary>Ends an asynchronous write operation that was started with a call to <see cref="M:System.Net.Security.NegotiateStream.BeginWrite(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If the operation has not completed, this method blocks until it does.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 To perform this operation synchronously, use the <xref:System.Net.Security.NegotiateStream.Write%2A> method.

## Examples

The following example demonstrates a method that is called to complete the asynchronous write operation. For an example that demonstrates starting the operation, see <xref:System.Net.Security.NegotiateStream.BeginWrite%2A>.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/AuthenticatedStream/Overview/client.cs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/System.Net.Security/AuthenticatedStream/Overview/client.vb" id="Snippet4":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="asyncResult" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">The asyncResult was not created by a call to <see cref="M:System.Net.Security.NegotiateStream.BeginWrite(System.Byte[],System.Int32,System.Int32,System.AsyncCallback,System.Object)" />.</exception>
        <exception cref="T:System.InvalidOperationException">There is no pending write operation to complete.

-or-

Authentication has not occurred.</exception>
        <exception cref="T:System.IO.IOException">The write operation failed.</exception>
      </Docs>
    </Member>
    <Member MemberName="Flush">
      <MemberSignature Language="C#" Value="public override void Flush ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance void Flush() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.Flush" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Sub Flush ()" />
      <MemberSignature Language="F#" Value="override this.Flush : unit -&gt; unit" Usage="negotiateStream.Flush " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override void Flush();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Causes any buffered data to be written to the underlying device.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method invokes <xref:System.IO.Stream.Flush%2A> on the underlying stream.

## Examples

The following code example demonstrates flushing the stream.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet4":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="FlushAsync">
      <MemberSignature Language="C#" Value="public override System.Threading.Tasks.Task FlushAsync (System.Threading.CancellationToken cancellationToken);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance class System.Threading.Tasks.Task FlushAsync(valuetype System.Threading.CancellationToken cancellationToken) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.FlushAsync(System.Threading.CancellationToken)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function FlushAsync (cancellationToken As CancellationToken) As Task" />
      <MemberSignature Language="F#" Value="override this.FlushAsync : System.Threading.CancellationToken -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.FlushAsync cancellationToken" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override System::Threading::Tasks::Task ^ FlushAsync(System::Threading::CancellationToken cancellationToken);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
        <summary>Asynchronously writes any buffered data to the underlying device.</summary>
        <returns>A task that represents the asynchronous flush operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method invokes <xref:System.IO.Stream.FlushAsync%2A> on the underlying stream.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.Flush>.

]]></format>
        </remarks>
        <exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
      </Docs>
    </Member>
    <Member MemberName="ImpersonationLevel">
      <MemberSignature Language="C#" Value="public virtual System.Security.Principal.TokenImpersonationLevel ImpersonationLevel { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance valuetype System.Security.Principal.TokenImpersonationLevel ImpersonationLevel" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.ImpersonationLevel" />
      <MemberSignature Language="VB.NET" Value="Public Overridable ReadOnly Property ImpersonationLevel As TokenImpersonationLevel" />
      <MemberSignature Language="F#" Value="member this.ImpersonationLevel : System.Security.Principal.TokenImpersonationLevel" Usage="System.Net.Security.NegotiateStream.ImpersonationLevel" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property System::Security::Principal::TokenImpersonationLevel ImpersonationLevel { System::Security::Principal::TokenImpersonationLevel get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Security.Principal.TokenImpersonationLevel</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a value that indicates how the server can use the client's credentials.</summary>
        <value>One of the <see cref="T:System.Security.Principal.TokenImpersonationLevel" /> values.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 You must successfully authenticate before calling this method. Clients specify the impersonation level when they request authentication by calling one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A> methods. If you authenticate without specifying a <xref:System.Security.Principal.TokenImpersonationLevel> , <xref:System.Security.Principal.TokenImpersonationLevel.Identification> is used.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet1":::

 ]]></format>
        </remarks>
        <exception cref="T:System.InvalidOperationException">Authentication failed or has not occurred.</exception>
      </Docs>
    </Member>
    <Member MemberName="IsAuthenticated">
      <MemberSignature Language="C#" Value="public override bool IsAuthenticated { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool IsAuthenticated" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.IsAuthenticated" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property IsAuthenticated As Boolean" />
      <MemberSignature Language="F#" Value="member this.IsAuthenticated : bool" Usage="System.Net.Security.NegotiateStream.IsAuthenticated" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool IsAuthenticated { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether authentication was successful.</summary>
        <value>
          <see langword="true" /> if successful authentication occurred; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Clients authenticate by calling the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A> or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A> methods. Servers authenticate by calling the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet1":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="IsEncrypted">
      <MemberSignature Language="C#" Value="public override bool IsEncrypted { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool IsEncrypted" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.IsEncrypted" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property IsEncrypted As Boolean" />
      <MemberSignature Language="F#" Value="member this.IsEncrypted : bool" Usage="System.Net.Security.NegotiateStream.IsEncrypted" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool IsEncrypted { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether this <see cref="T:System.Net.Security.NegotiateStream" /> uses data encryption.</summary>
        <value>
          <see langword="true" /> if data is encrypted before being transmitted over the network and decrypted when it reaches the remote endpoint; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Encryption helps to protect the privacy of the data; namely, it helps to ensure that while data is in transit it cannot be deciphered by third parties.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet1":::

 ]]></format>
        </remarks>
        <altmember cref="T:System.Net.Security.ProtectionLevel" />
      </Docs>
    </Member>
    <Member MemberName="IsMutuallyAuthenticated">
      <MemberSignature Language="C#" Value="public override bool IsMutuallyAuthenticated { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool IsMutuallyAuthenticated" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.IsMutuallyAuthenticated" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property IsMutuallyAuthenticated As Boolean" />
      <MemberSignature Language="F#" Value="member this.IsMutuallyAuthenticated : bool" Usage="System.Net.Security.NegotiateStream.IsMutuallyAuthenticated" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool IsMutuallyAuthenticated { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether both the server and the client have been authenticated.</summary>
        <value>
          <see langword="true" /> if the server has been authenticated; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Mutual authentication is specified by the client when the client wants the server to provide credentials for authentication. By default, clients request mutual authentication.

 The Negotiate protocol selects either NTLM or Kerberos depending on the security protocols supported by the client and server. NTLM does not support mutual authentication.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet1":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="IsServer">
      <MemberSignature Language="C#" Value="public override bool IsServer { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool IsServer" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.IsServer" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property IsServer As Boolean" />
      <MemberSignature Language="F#" Value="member this.IsServer : bool" Usage="System.Net.Security.NegotiateStream.IsServer" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool IsServer { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether the local side of the connection used by this <see cref="T:System.Net.Security.NegotiateStream" /> was authenticated as the server.</summary>
        <value>
          <see langword="true" /> if the local endpoint was successfully authenticated as the server side of the authenticated connection; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If authentication failed or did not occur, this property returns `false`.

 To authenticate as the server, call the <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A> or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet1":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="IsSigned">
      <MemberSignature Language="C#" Value="public override bool IsSigned { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool IsSigned" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.IsSigned" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property IsSigned As Boolean" />
      <MemberSignature Language="F#" Value="member this.IsSigned : bool" Usage="System.Net.Security.NegotiateStream.IsSigned" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property bool IsSigned { bool get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a <see cref="T:System.Boolean" /> value that indicates whether the data sent using this stream is signed.</summary>
        <value>
          <see langword="true" /> if the data is signed before being transmitted; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Data signing helps to protect the integrity of the data; namely, it helps the recipient determine whether the data has been tampered with while in transit.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet1":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="Length">
      <MemberSignature Language="C#" Value="public override long Length { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance int64 Length" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.Length" />
      <MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property Length As Long" />
      <MemberSignature Language="F#" Value="member this.Length : int64" Usage="System.Net.Security.NegotiateStream.Length" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property long Length { long get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int64</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets the length of the underlying stream.</summary>
        <value>A <see cref="T:System.Int64" /> that specifies the length of the underlying stream.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property returns the value returned by invoking the <xref:System.IO.Stream.Length%2A> property on the underlying stream. If the underlying stream is not seekable, this property will typically throw an exception. The run-time type of the underlying stream determines the run-time type of the exception that is thrown.



## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
        <exception cref="T:System.NotSupportedException">Getting the value of this property is not supported when the underlying stream is a <see cref="T:System.Net.Sockets.NetworkStream" />.</exception>
      </Docs>
    </Member>
    <Member MemberName="Position">
      <MemberSignature Language="C#" Value="public override long Position { get; set; }" />
      <MemberSignature Language="ILAsm" Value=".property instance int64 Position" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.Position" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Property Position As Long" />
      <MemberSignature Language="F#" Value="member this.Position : int64 with get, set" Usage="System.Net.Security.NegotiateStream.Position" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property long Position { long get(); void set(long value); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int64</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets or sets the current position in the underlying stream.</summary>
        <value>A <see cref="T:System.Int64" /> that specifies the current position in the underlying stream.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property returns the value returned by invoking the <xref:System.IO.Stream.Position%2A> property on the underlying stream. If the underlying stream is not seekable, this property will typically throw an exception. The run-time type of the underlying stream determines the run-time type of the exception that is thrown.

 ]]></format>
        </remarks>
        <exception cref="T:System.NotSupportedException">Setting this property is not supported.

-or-

 Getting the value of this property is not supported when the underlying stream is a <see cref="T:System.Net.Sockets.NetworkStream" />.</exception>
      </Docs>
    </Member>
    <Member MemberName="Read">
      <MemberSignature Language="C#" Value="public override int Read (byte[] buffer, int offset, int count);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance int32 Read(unsigned int8[] buffer, int32 offset, int32 count) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.Read(System.Byte[],System.Int32,System.Int32)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function Read (buffer As Byte(), offset As Integer, count As Integer) As Integer" />
      <MemberSignature Language="F#" Value="override this.Read : byte[] * int * int -&gt; int" Usage="negotiateStream.Read (buffer, offset, count)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override int Read(cli::array &lt;System::Byte&gt; ^ buffer, int offset, int count);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int32</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Byte[]" />
        <Parameter Name="offset" Type="System.Int32" />
        <Parameter Name="count" Type="System.Int32" />
      </Parameters>
      <Docs>
        <param name="buffer">A <see cref="T:System.Byte" /> array that receives the bytes read from the stream.</param>
        <param name="offset">A <see cref="T:System.Int32" /> containing the zero-based location in <paramref name="buffer" /> at which to begin storing the data read from this stream.</param>
        <param name="count">A <see cref="T:System.Int32" /> containing the maximum number of bytes to read from the stream.</param>
        <summary>Reads data from this stream and stores it in the specified array.</summary>
        <returns>An <see cref="T:System.Int32" /> value that specifies the number of bytes read from the underlying stream. When there is no more data to be read, returns 0.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The method reads a maximum of `count` bytes from the current stream and stores them in `buffer` beginning at `offset`.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 To perform this operation asynchronously, use the <xref:System.Net.Security.NegotiateStream.ReadAsync%2A> method.

## Examples

The following code example demonstrates reading from a <xref:System.Net.Security.NegotiateStream>.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/Read/server.cs" id="Snippet1":::

 ]]></format>
        </remarks>
        <exception cref="T:System.IO.IOException">The read operation failed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
        <exception cref="T:System.NotSupportedException">A <see cref="M:System.Net.Security.NegotiateStream.Read(System.Byte[],System.Int32,System.Int32)" /> operation is already in progress.</exception>
      </Docs>
    </Member>
    <Member MemberName="ReadAsync">
      <MemberSignature Language="C#" Value="public override System.Threading.Tasks.ValueTask&lt;int&gt; ReadAsync (Memory&lt;byte&gt; buffer, System.Threading.CancellationToken cancellationToken = default);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance valuetype System.Threading.Tasks.ValueTask`1&lt;int32&gt; ReadAsync(valuetype System.Memory`1&lt;unsigned int8&gt; buffer, valuetype System.Threading.CancellationToken cancellationToken) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.ReadAsync(System.Memory{System.Byte},System.Threading.CancellationToken)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function ReadAsync (buffer As Memory(Of Byte), Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of Integer)" />
      <MemberSignature Language="F#" Value="override this.ReadAsync : Memory&lt;byte&gt; * System.Threading.CancellationToken -&gt; System.Threading.Tasks.ValueTask&lt;int&gt;" Usage="negotiateStream.ReadAsync (buffer, cancellationToken)" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.ValueTask&lt;System.Int32&gt;</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Memory&lt;System.Byte&gt;" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      </Parameters>
      <Docs>
        <param name="buffer">The buffer to write the data to.</param>
        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
        <summary>Reads data asynchronously from the <see cref="T:System.Net.Security.NegotiateStream" /> and stores it in a byte memory range as an asynchronous operation.</summary>
        <returns>A <see cref="T:System.Threading.Tasks.ValueTask`1" /> that represents the asynchronous read operation. The value of its <see cref="P:System.Threading.Tasks.ValueTask`1.Result" /> property contains the total number of bytes read into <paramref name="buffer" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
This method reads asynchronously as much data as is available into `buffer` and returns the number of bytes successfully read.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 ]]></format>
        </remarks>
        <exception cref="T:System.IO.IOException">The read operation failed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
        <exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
      </Docs>
    </Member>
    <Member MemberName="ReadAsync">
      <MemberSignature Language="C#" Value="public override System.Threading.Tasks.Task&lt;int&gt; ReadAsync (byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance class System.Threading.Tasks.Task`1&lt;int32&gt; ReadAsync(unsigned int8[] buffer, int32 offset, int32 count, valuetype System.Threading.CancellationToken cancellationToken) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.ReadAsync(System.Byte[],System.Int32,System.Int32,System.Threading.CancellationToken)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function ReadAsync (buffer As Byte(), offset As Integer, count As Integer, cancellationToken As CancellationToken) As Task(Of Integer)" />
      <MemberSignature Language="F#" Value="override this.ReadAsync : byte[] * int * int * System.Threading.CancellationToken -&gt; System.Threading.Tasks.Task&lt;int&gt;" Usage="negotiateStream.ReadAsync (buffer, offset, count, cancellationToken)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override System::Threading::Tasks::Task&lt;int&gt; ^ ReadAsync(cli::array &lt;System::Byte&gt; ^ buffer, int offset, int count, System::Threading::CancellationToken cancellationToken);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task&lt;System.Int32&gt;</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Byte[]" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="offset" Type="System.Int32" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="count" Type="System.Int32" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      </Parameters>
      <Docs>
        <param name="buffer">A <see cref="T:System.Byte" /> array that receives the bytes read from the stream.</param>
        <param name="offset">A <see cref="T:System.Int32" /> containing the zero-based location in <paramref name="buffer" /> at which to begin storing the data read from this stream.</param>
        <param name="count">A <see cref="T:System.Int32" /> containing the maximum number of bytes to read from the stream.</param>
        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
        <summary>Reads data asynchronously from this stream and stores it in the specified array.</summary>
        <returns>An <see cref="T:System.Int32" /> value that specifies the number of bytes read from the underlying stream. When there is no more data to be read, returns 0.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The method reads asynchronously a maximum of `count` bytes from the current stream and stores them in `buffer` beginning at `offset`.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.Read(System.Byte[],System.Int32,System.Int32)>.

]]></format>
        </remarks>
        <exception cref="T:System.IO.IOException">The read operation failed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
        <exception cref="T:System.NotSupportedException">A <see cref="M:System.Net.Security.NegotiateStream.Read(System.Byte[],System.Int32,System.Int32)" /> operation is already in progress.</exception>
        <exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
      </Docs>
    </Member>
    <Member MemberName="ReadTimeout">
      <MemberSignature Language="C#" Value="public override int ReadTimeout { get; set; }" />
      <MemberSignature Language="ILAsm" Value=".property instance int32 ReadTimeout" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.ReadTimeout" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Property ReadTimeout As Integer" />
      <MemberSignature Language="F#" Value="member this.ReadTimeout : int with get, set" Usage="System.Net.Security.NegotiateStream.ReadTimeout" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property int ReadTimeout { int get(); void set(int value); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int32</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets or sets the amount of time a read operation blocks waiting for data.</summary>
        <value>A <see cref="T:System.Int32" /> that specifies the amount of time that will elapse before a read operation fails.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property returns the value returned by invoking the <xref:System.IO.Stream.ReadTimeout%2A> property on the underlying stream. When you set this property, the <xref:System.IO.Stream.ReadTimeout%2A> value on the underlying stream is set to the specified value.

 If the underlying stream is a <xref:System.Net.Sockets.NetworkStream>, <xref:System.Net.Security.NegotiateStream.ReadTimeout%2A> is in milliseconds and is set to <xref:System.Threading.Timeout.Infinite> by default so that read operations do not time out.



## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="RemoteIdentity">
      <MemberSignature Language="C#" Value="public virtual System.Security.Principal.IIdentity RemoteIdentity { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance class System.Security.Principal.IIdentity RemoteIdentity" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.RemoteIdentity" />
      <MemberSignature Language="VB.NET" Value="Public Overridable ReadOnly Property RemoteIdentity As IIdentity" />
      <MemberSignature Language="F#" Value="member this.RemoteIdentity : System.Security.Principal.IIdentity" Usage="System.Net.Security.NegotiateStream.RemoteIdentity" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property System::Security::Principal::IIdentity ^ RemoteIdentity { System::Security::Principal::IIdentity ^ get(); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Security.Principal.IIdentity</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets information about the identity of the remote party sharing this authenticated stream.</summary>
        <value>An <see cref="T:System.Security.Principal.IIdentity" /> object that describes the identity of the remote endpoint.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 When accessed by the client, this property returns a <xref:System.Security.Principal.GenericIdentity> containing the Service Principal Name (SPN) of the server and the authentication protocol used. When accessed by the server, this property returns a <xref:System.Security.Principal.WindowsIdentity> that describes the client. If the <xref:System.Security.Principal.WindowsIdentity> is not available, client information is returned to the server in a <xref:System.Security.Principal.GenericIdentity>.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/Overview/server.cs" id="Snippet2":::

 ]]></format>
        </remarks>
        <exception cref="T:System.InvalidOperationException">Authentication failed or has not occurred.</exception>
      </Docs>
    </Member>
    <Member MemberName="Seek">
      <MemberSignature Language="C#" Value="public override long Seek (long offset, System.IO.SeekOrigin origin);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance int64 Seek(int64 offset, valuetype System.IO.SeekOrigin origin) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.Seek(System.Int64,System.IO.SeekOrigin)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function Seek (offset As Long, origin As SeekOrigin) As Long" />
      <MemberSignature Language="F#" Value="override this.Seek : int64 * System.IO.SeekOrigin -&gt; int64" Usage="negotiateStream.Seek (offset, origin)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override long Seek(long offset, System::IO::SeekOrigin origin);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int64</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="offset" Type="System.Int64" />
        <Parameter Name="origin" Type="System.IO.SeekOrigin" />
      </Parameters>
      <Docs>
        <param name="offset">This value is ignored.</param>
        <param name="origin">This value is ignored.</param>
        <summary>Throws <see cref="T:System.NotSupportedException" />.</summary>
        <returns>Always throws a <see cref="T:System.NotSupportedException" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 Do not call this method. It is inherited, but is not supported by <xref:System.Net.Security.NegotiateStream>.

 ]]></format>
        </remarks>
        <exception cref="T:System.NotSupportedException">Seeking is not supported on <see cref="T:System.Net.Security.NegotiateStream" />.</exception>
      </Docs>
    </Member>
    <Member MemberName="SetLength">
      <MemberSignature Language="C#" Value="public override void SetLength (long value);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance void SetLength(int64 value) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.SetLength(System.Int64)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Sub SetLength (value As Long)" />
      <MemberSignature Language="F#" Value="override this.SetLength : int64 -&gt; unit" Usage="negotiateStream.SetLength value" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override void SetLength(long value);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="value" Type="System.Int64" />
      </Parameters>
      <Docs>
        <param name="value">An <see cref="T:System.Int64" /> value that specifies the length of the stream.</param>
        <summary>Sets the length of the underlying stream.</summary>
        <remarks>To be added.</remarks>
      </Docs>
    </Member>
    <Member MemberName="Write">
      <MemberSignature Language="C#" Value="public override void Write (byte[] buffer, int offset, int count);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance void Write(unsigned int8[] buffer, int32 offset, int32 count) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.Write(System.Byte[],System.Int32,System.Int32)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Sub Write (buffer As Byte(), offset As Integer, count As Integer)" />
      <MemberSignature Language="F#" Value="override this.Write : byte[] * int * int -&gt; unit" Usage="negotiateStream.Write (buffer, offset, count)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override void Write(cli::array &lt;System::Byte&gt; ^ buffer, int offset, int count);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Byte[]" />
        <Parameter Name="offset" Type="System.Int32" />
        <Parameter Name="count" Type="System.Int32" />
      </Parameters>
      <Docs>
        <param name="buffer">A <see cref="T:System.Byte" /> array that supplies the bytes written to the stream.</param>
        <param name="offset">An <see cref="T:System.Int32" /> containing the zero-based location in <paramref name="buffer" /> at which to begin reading bytes to be written to the stream.</param>
        <param name="count">A <see cref="T:System.Int32" /> containing the number of bytes to read from <paramref name="buffer" />.</param>
        <summary>Write the specified number of <see cref="T:System.Byte" />s to the underlying stream using the specified buffer and offset.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If encryption, signing, or encryption and signing are enabled, this method reads the data from buffer, encrypts, signs, or encrypts and signs it, and transmits it using the underlying stream. If no security services such as data encryption or signing are in use, this method invokes <xref:System.IO.Stream.Write%2A> on the underlying stream.

 This method blocks while the write operation completes. To prevent blocking while the operation completes, use the <xref:System.Net.Security.NegotiateStream.WriteAsync%2A> method.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 The <xref:System.Net.Security.NegotiateStream> class does not support multiple simultaneous write operations. If you attempt to start a write operation while another write operation is already executing on the same stream, a <xref:System.NotSupportedException> exception will be thrown.

## Examples

The following code example demonstrates writing to a <xref:System.Net.Security.NegotiateStream>.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet4":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="buffer" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="offset" /> is less than 0.

-or-

 <paramref name="offset" /> is greater than the length of <paramref name="buffer" />.

-or-

 <paramref name="offset" /> plus count is greater than the length of <paramref name="buffer" />.</exception>
        <exception cref="T:System.IO.IOException">The write operation failed.

-or-

 Encryption is in use, but the data could not be encrypted.</exception>
        <exception cref="T:System.NotSupportedException">There is already a write operation in progress.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
      </Docs>
    </Member>
    <Member MemberName="WriteAsync">
      <MemberSignature Language="C#" Value="public override System.Threading.Tasks.ValueTask WriteAsync (ReadOnlyMemory&lt;byte&gt; buffer, System.Threading.CancellationToken cancellationToken = default);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance valuetype System.Threading.Tasks.ValueTask WriteAsync(valuetype System.ReadOnlyMemory`1&lt;unsigned int8&gt; buffer, valuetype System.Threading.CancellationToken cancellationToken) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.WriteAsync(System.ReadOnlyMemory{System.Byte},System.Threading.CancellationToken)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function WriteAsync (buffer As ReadOnlyMemory(Of Byte), Optional cancellationToken As CancellationToken = Nothing) As ValueTask" />
      <MemberSignature Language="F#" Value="override this.WriteAsync : ReadOnlyMemory&lt;byte&gt; * System.Threading.CancellationToken -&gt; System.Threading.Tasks.ValueTask" Usage="negotiateStream.WriteAsync (buffer, cancellationToken)" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.ValueTask</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.ReadOnlyMemory&lt;System.Byte&gt;" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      </Parameters>
      <Docs>
        <param name="buffer">A region of memory that contains the data to write to the <see cref="T:System.Net.Security.NegotiateStream" />.</param>
        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
        <summary>Write asynchronously the specified number of <see cref="T:System.Byte" />s to the underlying stream.</summary>
        <returns>A <see cref="T:System.Threading.Tasks.ValueTask" /> that represents the asynchronous read operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If encryption, signing, or encryption and signing are enabled, this method reads the data from buffer, encrypts, signs, or encrypts and signs it, and transmits it using the underlying stream. If no security services such as data encryption or signing are in use, this method invokes <xref:System.IO.Stream.WriteAsync%2A> on the underlying stream.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
        <exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
      </Docs>
    </Member>
    <Member MemberName="WriteAsync">
      <MemberSignature Language="C#" Value="public override System.Threading.Tasks.Task WriteAsync (byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance class System.Threading.Tasks.Task WriteAsync(unsigned int8[] buffer, int32 offset, int32 count, valuetype System.Threading.CancellationToken cancellationToken) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Net.Security.NegotiateStream.WriteAsync(System.Byte[],System.Int32,System.Int32,System.Threading.CancellationToken)" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Function WriteAsync (buffer As Byte(), offset As Integer, count As Integer, cancellationToken As CancellationToken) As Task" />
      <MemberSignature Language="F#" Value="override this.WriteAsync : byte[] * int * int * System.Threading.CancellationToken -&gt; System.Threading.Tasks.Task" Usage="negotiateStream.WriteAsync (buffer, offset, count, cancellationToken)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; override System::Threading::Tasks::Task ^ WriteAsync(cli::array &lt;System::Byte&gt; ^ buffer, int offset, int count, System::Threading::CancellationToken cancellationToken);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Threading.Tasks.Task</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="buffer" Type="System.Byte[]" Index="0" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="offset" Type="System.Int32" Index="1" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="count" Type="System.Int32" Index="2" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
        <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
      </Parameters>
      <Docs>
        <param name="buffer">A <see cref="T:System.Byte" /> array that supplies the bytes written to the stream.</param>
        <param name="offset">An <see cref="T:System.Int32" /> containing the zero-based location in <paramref name="buffer" /> at which to begin reading bytes to be written to the stream.</param>
        <param name="count">A <see cref="T:System.Int32" /> containing the number of bytes to read from <paramref name="buffer" />.</param>
        <param name="cancellationToken">To be added.</param>
        <summary>Write asynchronously the specified number of <see cref="T:System.Byte" />s to the underlying stream.</summary>
        <returns>A <see cref="T:System.Threading.Tasks.Task" /> that represents the asynchronous read operation.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If encryption, signing, or encryption and signing are enabled, this method reads the data from buffer, encrypts, signs, or encrypts and signs it, and transmits it using the underlying stream. If no security services such as data encryption or signing are in use, this method invokes <xref:System.IO.Stream.WriteAsync%2A> on the underlying stream.

 You cannot call this method until you have successfully authenticated. To authenticate, call one of the <xref:System.Net.Security.NegotiateStream.AuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsClientAsync%2A>, <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsClient%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServer%2A>, <xref:System.Net.Security.NegotiateStream.AuthenticateAsServerAsync%2A>, or <xref:System.Net.Security.NegotiateStream.BeginAuthenticateAsServer%2A> methods.

 This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.Net.Security.NegotiateStream.Write(System.Byte[],System.Int32,System.Int32)>.

]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="buffer" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="offset" /> is less than 0.

-or-

 <paramref name="offset" /> is greater than the length of <paramref name="buffer" />.

-or-

 <paramref name="offset" /> plus count is greater than the length of <paramref name="buffer" />.</exception>
        <exception cref="T:System.IO.IOException">The write operation failed.

-or-

 Encryption is in use, but the data could not be encrypted.</exception>
        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
        <exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
      </Docs>
    </Member>
    <Member MemberName="WriteTimeout">
      <MemberSignature Language="C#" Value="public override int WriteTimeout { get; set; }" />
      <MemberSignature Language="ILAsm" Value=".property instance int32 WriteTimeout" />
      <MemberSignature Language="DocId" Value="P:System.Net.Security.NegotiateStream.WriteTimeout" />
      <MemberSignature Language="VB.NET" Value="Public Overrides Property WriteTimeout As Integer" />
      <MemberSignature Language="F#" Value="member this.WriteTimeout : int with get, set" Usage="System.Net.Security.NegotiateStream.WriteTimeout" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property int WriteTimeout { int get(); void set(int value); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Net.Security</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Int32</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets or sets the amount of time a write operation blocks waiting for data.</summary>
        <value>A <see cref="T:System.Int32" /> that specifies the amount of time that will elapse before a write operation fails.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property returns the value returned by invoking the <xref:System.IO.Stream.WriteTimeout%2A> property on the underlying stream. For set operations, the specified value sets the <xref:System.IO.Stream.WriteTimeout%2A> value on the underlying stream.

 If the underlying stream is a <xref:System.Net.Sockets.NetworkStream>, <xref:System.Net.Security.NegotiateStream.WriteTimeout%2A> is in milliseconds and is set to <xref:System.Threading.Timeout.Infinite> by default so that write operations do not time out.

## Examples

The following code example demonstrates displaying the value of this property.

:::code language="csharp" source="~/snippets/csharp/System.Net.Security/NegotiateStream/.ctor/client.cs" id="Snippet2":::

 ]]></format>
        </remarks>
      </Docs>
    </Member>
  </Members>
</Type>