diff --git a/build-tools/automation/yaml-templates/variables.yaml b/build-tools/automation/yaml-templates/variables.yaml
index 27bcf5d0ca5..1bbe24740be 100644
--- a/build-tools/automation/yaml-templates/variables.yaml
+++ b/build-tools/automation/yaml-templates/variables.yaml
@@ -74,3 +74,9 @@ variables:
   value: true
 - name: DOTNET_SYSTEM_NET_SECURITY_NOREVOCATIONCHECKBYDEFAULT
   value: true
+- name: DOTNET_CLI_TELEMETRY_OPTOUT
+  value: true
+- name: DOTNET_NOLOGO
+  value: true
+- name: DOTNET_GENERATE_ASPNET_CERTIFICATE
+  value: false
diff --git a/build-tools/xaprepare/xaprepare/Application/ProcessRunner.cs b/build-tools/xaprepare/xaprepare/Application/ProcessRunner.cs
index b225ddd897a..db4f11f7675 100644
--- a/build-tools/xaprepare/xaprepare/Application/ProcessRunner.cs
+++ b/build-tools/xaprepare/xaprepare/Application/ProcessRunner.cs
@@ -290,7 +290,7 @@ public bool Run ()
 			if (!exited) {
 				Log.ErrorLine ($"Process '{FullCommandLine}' timed out after {ProcessTimeout}");
 				ErrorReason = ErrorReasonCode.ExecutionTimedOut;
-				process.Kill ();
+				process.Kill (entireProcessTree: true);
 			}
 
 			// See: https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.process.waitforexit?view=netframework-4.7.2#System_Diagnostics_Process_WaitForExit)
diff --git a/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs b/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
index 4323ff2f8fc..c5896a83c69 100644
--- a/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
+++ b/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
@@ -41,14 +41,34 @@ protected override async Task<bool> Execute (Context context)
 
 			// Install runtime packs associated with the SDK previously installed.
 			var packageDownloadProj = Path.Combine (BuildPaths.XamarinAndroidSourceRoot, "build-tools", "xaprepare", "xaprepare", "package-download.proj");
-			var logPath = Path.Combine (Configurables.Paths.BuildBinDir, $"msbuild-{context.BuildTimeStamp}-download-runtime-packs.binlog");
-			var restoreArgs = new string [] { "restore",
-				ProcessRunner.QuoteArgument (packageDownloadProj),
-				"--configfile", Path.Combine (BuildPaths.XamarinAndroidSourceRoot, "NuGet.config"),
-				ProcessRunner.QuoteArgument ($"-bl:{logPath}"),
-			};
-			if (!Utilities.RunCommand (Configurables.Paths.DotNetPreviewTool, restoreArgs)) {
-				Log.ErrorLine ($"Failed to restore runtime packs using '{packageDownloadProj}'.");
+			var logPathBase = Path.Combine (Configurables.Paths.BuildBinDir, $"msbuild-{context.BuildTimeStamp}-download-runtime-packs");
+
+			const int maxAttempts = 3;
+			const int initialBackoffDelayMilliseconds = 2000;
+			bool restoreSucceeded = false;
+			for (int attempt = 1; attempt <= maxAttempts; attempt++) {
+				var logPath = $"{logPathBase}-attempt{attempt}.binlog";
+				var runner = new ProcessRunner (Configurables.Paths.DotNetPreviewTool, "restore",
+					packageDownloadProj,
+					"--configfile", Path.Combine (BuildPaths.XamarinAndroidSourceRoot, "NuGet.config"),
+					$"-bl:{logPath}",
+					"--verbosity", "normal"
+				) {
+					EchoStandardOutput = true,
+					EchoStandardError = true,
+				};
+				if (runner.Run ()) {
+					restoreSucceeded = true;
+					break;
+				}
+				if (attempt < maxAttempts) {
+					Log.WarningLine ($"Failed to restore runtime packs (attempt {attempt}/{maxAttempts}), retrying...");
+					var delayMilliseconds = initialBackoffDelayMilliseconds * (1 << (attempt - 1));
+					await Task.Delay (delayMilliseconds);
+				}
+			}
+			if (!restoreSucceeded) {
+				Log.ErrorLine ($"Failed to restore runtime packs using '{packageDownloadProj}' after {maxAttempts} attempts.");
 				return false;
 			}