Enterprise authentication tests are failing with PlatformNotSupportedException #68366
Description
Starting: System.Net.Http.Enterprise.Tests (parallel test collections = on, max threads = 4)
System.Net.Http.Enterprise.Tests.HttpClientAuthenticationTest.HttpClient_ValidAuthentication_Success(url: "http://apacheweb.linux.contoso.com/auth/kerberos/", useDomain: False, useAltPort: False) [STARTING]
Unhandled exception. System.PlatformNotSupportedException: Requested protection level is not supported with the GSSAPI implementation currently installed.
at System.Net.Security.NegotiateStreamPal.InitializeSecurityContext(SafeFreeCredentials& credentialsHandle, SafeDeleteContext& securityContext, String spn, ContextFlagsPal requestedContextFlags, Byte[] incomingBlob, ChannelBinding channelBinding, Byte[]& resultBlob, ContextFlagsPal& contextFlags) in /repo/src/libraries/Common/src/System/Net/Security/NegotiateStreamPal.Unix.cs:line 384
at System.Net.NTAuthentication.GetOutgoingBlob(Byte[] incomingBlob, Boolean throwOnError, SecurityStatusPal& statusCode) in /repo/src/libraries/Common/src/System/Net/NTAuthentication.Common.cs:line 215
at System.Net.NTAuthentication.GetOutgoingBlob(Byte[] incomingBlob, Boolean thrownOnError) in /repo/src/libraries/Common/src/System/Net/NTAuthentication.Common.cs:line 201
at System.Net.NTAuthentication.GetOutgoingBlob(String incomingBlob) in /repo/src/libraries/Common/src/System/Net/NTAuthentication.Common.cs:line 182
at System.Net.Http.AuthenticationHelper.SendWithNtAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean isProxyAuth, HttpConnection connection, HttpConnectionPool connectionPool, CancellationToken cancellationToken) in /repo/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/AuthenticationHelper.NtAuth.cs:line 198
at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken) in /repo/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnectionPool.cs:line 1033
at System.Net.Http.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationTo
This seems to be regression from #66879 @filipnavara. I look at the change again and nothing obvious pop up but I sync code just before the change and everything would pass.
It seems to fail on chat that confidentiality is set but was not requested. I don't know why that would matter but I would not expect behavior differences in Kerberos from the managed NTLM.
The test should runable again with #68311