String urls = "url";
        HttpWebRequest request = HttpWebRequest.CreateHttp(urls);
        request.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => false;
        Console.WriteLine(request.AuthenticationLevel);

        var credentials = new UsernamePasswordCredentials
        {
            Username = "user",
            Password = "pass"
        };

        var remote = Repository.ListRemoteReferences("url", (url, fromUrl, types) => credentials);

        foreach (var reference in remote)
        {
            Console.WriteLine(reference.TargetIdentifier);
        }