stacktrace.txt

Microsoft.TeamFoundation.Git.CoreServices.dll!Microsoft.TeamFoundation.Git.CoreServices.TfsSmartSubtransport.TfsSmartTransportStream.Read(System.IO.Stream dataStream, long length, out long bytesRead)
LibGit2Sharp.dll!LibGit2Sharp.SmartSubtransportStream.EntryPoints.Read(System.IntPtr stream, System.IntPtr buffer, System.UIntPtr buf_size, out System.UIntPtr bytes_read)
[Native to Managed Transition]   
git2-msvstfs.dll!0f442ec7()
…
git2-msvstfs.dll!0f3fab42()
[Managed to Native Transition]   
LibGit2Sharp.dll!LibGit2Sharp.Core.Proxy.git_clone(string url, string workdir, LibGit2Sharp.Core.GitCloneOptions opts)
LibGit2Sharp.dll!LibGit2Sharp.Repository.Clone(string sourceUrl, string workdirPath, bool bare, bool checkout, LibGit2Sharp.Handlers.TransferProgressHandler onTransferProgress, LibGit2Sharp.Handlers.CheckoutProgressHandler onCheckoutProgress, LibGit2Sharp.Credentials credentials)
Microsoft.TeamFoundation.Git.CoreServices.dll!Microsoft.TeamFoundation.Git.CoreServices.SccCloneJob.Execute()

TfsGitSession.cs

class TfsGitSession : IDisposable
{
    IDisposable httpsDefinition;

    public TfsGitSession()
    {
        // we need to perform this... through reflection
        //httpsDefinition = new SmartSubtransportDefinition<TfsSmartSubtransport>("https://", 2);

        var tfsSmartSubTransportType = Type.GetType("Microsoft.TeamFoundation.Git.CoreServices.TfsSmartSubtransport, Microsoft.TeamFoundation.Git.CoreServices, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", true);
        var smartSubtransportDefinitionType = typeof(SmartSubtransportDefinition<>).MakeGenericType(tfsSmartSubTransportType);

        httpsDefinition = (IDisposable)Activator.CreateInstance(smartSubtransportDefinitionType, "https://", 2);
    }

    public void Dispose()
    {
        httpsDefinition.Dispose();
    }
}

TfsGitSessionUsage.cs

using (new TfsGitSession())
{
    Repository.Clone(cloneUrl, localPath);
}

I'm trying to use this with latest version of libgit2sharp for NTLM authentication. Type SmartSubtransportDefinition<> is not found in LibGit2Sharp. Can you please update your gist ?