diff --git a/source/Halibut/Diagnostics/ExceptionReturnedByHalibutProxyExtensionMethod.cs b/source/Halibut/Diagnostics/ExceptionReturnedByHalibutProxyExtensionMethod.cs
index 9c0a6014..138bf5da 100644
--- a/source/Halibut/Diagnostics/ExceptionReturnedByHalibutProxyExtensionMethod.cs
+++ b/source/Halibut/Diagnostics/ExceptionReturnedByHalibutProxyExtensionMethod.cs
@@ -115,7 +115,8 @@ public static HalibutNetworkExceptionType IsNetworkError(this Exception exceptio
                 if (exception.Message.Contains("The remote party closed the WebSocket connection without completing the close handshake.")) return HalibutNetworkExceptionType.IsNetworkError;
                 if (exception.Message.Contains("Unable to read data from the transport connection: Operation timed out.")) return HalibutNetworkExceptionType.IsNetworkError;
                 if (exception.Message.Contains("Unable to write data to the transport connection: Operation timed out.")) return HalibutNetworkExceptionType.IsNetworkError;
-                
+                if (exception.Message.Contains("The client was unable to establish the initial connection within the timeout")) return HalibutNetworkExceptionType.IsNetworkError;
+
             }
 
             return HalibutNetworkExceptionType.UnknownError;