Getting exception "too many redirects or authentication replays"

[AndersBillLinden]

I am trying to pull from a github repository with the following code getting an exception "too many redirects or authentication replays". Why? If I failed to login, I expect an exception telling me that. Also the exception suggests that it retried whatever it did a couple of times although "replay" needs clarification. Where do I configure the number of retries if any? I have no interest in trying more than once. I have checked the credentials many times and also I tried to pull from an azure devops repo with the same result.

public void dothepulling()
{
  string repoPath = "C:\\project\\test.git";

  using (var repo = new Repository(repoPath))
  {

    var FetchOptions = new FetchOptions
    {
      CredentialsProvider = func
    };

    var pullOptions = new PullOptions
    {
      MergeOptions = new MergeOptions
      {
        FastForwardStrategy = FastForwardStrategy.FastForwardOnly,
        FileConflictStrategy = CheckoutFileConflictStrategy.Theirs,
        IgnoreWhitespaceChange = false
      },
      FetchOptions = FetchOptions
    };

    var signature = new Signature(new Identity("Firstname Lastname", 
      "[email protected]"), DateTimeOffset.Now);

    Commands.Pull(repo, signature, pullOptions);
  }
}

private UsernamePasswordCredentials func(string url, string user,
  SupportedCredentialTypes types)
{
  return new UsernamePasswordCredentials
  {
    Username = "username",
    Password = "password"
  };
}

[BrotherBrine]

I'm getting the same error as @AndersBillLinden on the Clone request. using LibGit2Sharp v0.28.0 and LibGit2Sharp.NativeBinaries v2.0.320

[old-guy-coder]

I am seeing the same error on LibGit2Sharp v0.30.0, any update on this?

Update

I have the following code and have tried with CustomHeader and the UsernamePasswordCredentials set for the CredentialsProvider and get a 400 response back from Clone. The following code uses just the CustomHeader and gets the same 400 response.

sourceUrl is https://{orgName}@dev.azure.com/{orgName}/{projectName}/_git/{repoName}

var repoPath = LibGit2Sharp.Repository.Clone(
    sourceUrl,
    workingDirectoryPath,
    new CloneOptions
    {
        Checkout = true,
        FetchOptions =
        {
            Prune = true,
            CustomHeaders = new[]
            {
                "Authorization: Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(
                    string.Format(CultureInfo.CurrentCulture, "{0}:{1}", "", _azureDevOpsOptions.PatToken)))
            }
        }
    });

Using just the CredentialProvider I get the error that the OP reported, have a brand new PAT token so I know that's not the issue! So I have some questions because this was working a few months back:

1. Should the PAT token be base64 encoded in the CredentialProvider?
2. Does 2FA have any impact on this? Would that be the reason for the original error?