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.
| 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 |
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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.
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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.