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Test NTLM authentication

Intro

This repo contains a Visual Studio solution with unittests to test NTLM authentication on the different .Net platforms. For a lot of our clients we still need to use NTLM authentication and it is not working properly in a lot of situations.

The unit tests use HttpClient to connect to a testpage I created in Azure for the purpose of testing NTLM (http://testntlm.westus2.cloudapp.azure.com/testntlm.htm). The unit tests also contain Basic and Digest authentication tests.

Test results

Platform Use NetworkCredentials Use CredentialCache
Windows .NET Core 2.1 Success Success
Windows .NET Core 3.1 Success Success
Windows .NET Core 5.0 Success Success
Mac .NET Core 2.1 FAIL Success
Mac .NET Core 3.1 FAIL Success
Mac .NET Core 5.0 FAIL FAIL
Xamarin Android using MonoWebRequestHandler Success Success
Xamarin iOS using Managed HttpClient FAIL FAIL
Xamarin Mac using Managed HttpClient FAIL FAIL

Notes

  • In order to get it partly working on Mac .NET Core (2 and 3) I had to add following line:

    AppContext.SetSwitch("System.Net.Http.UseSocketsHttpHandler", false);

    It then works for CredentialCache but not NetworkCredential. Also it completely doesn't work on Mac .NET Core 5.

  • In order to get it working on Android I had to change the project file to fallback to the old MonoWebRequestHandler

    <AndroidHttpClientHandlerType>System.Net.Http.MonoWebRequestHandler, System.Net.Http</AndroidHttpClientHandlerType>

  • The unittests on Xamarin Mac are written using NUnit instead of XUnit.