DotNetOpenAuth Twitter鉴权返回401 Unauthorized

我开始用Twitter把我的头发扯掉，并试图注册一个用户!!我有Facebook, Google, OpenId都工作得很好，只是Twitter是一个痛苦。

当我试图运行我的代码时，我不断得到401未经授权，我的生活无法弄清楚为什么。

我已经创建了一个twitter客户端，并且我正在使用它与InMemoryTokenManager从DotNetOpenAuth示例解决方案。我的Twitter客户端在这里

public class TwitterClient
{
    private string UserName { get; set; }
    private static readonly ServiceProviderDescription ServiceDescription =
        new ServiceProviderDescription
        {
            RequestTokenEndpoint = new MessageReceivingEndpoint(
                                       "https://api.twitter.com/oauth/request_token",
                                       HttpDeliveryMethods.GetRequest |
                                       HttpDeliveryMethods.AuthorizationHeaderRequest),
            UserAuthorizationEndpoint = new MessageReceivingEndpoint(
                                      "https://api.twitter.com/oauth/authorize",
                                      HttpDeliveryMethods.GetRequest |
                                      HttpDeliveryMethods.AuthorizationHeaderRequest),
            AccessTokenEndpoint = new MessageReceivingEndpoint(
                                      "https://api.twitter.com/oauth/access_token",
                                      HttpDeliveryMethods.GetRequest |
                                      HttpDeliveryMethods.AuthorizationHeaderRequest),
            TamperProtectionElements = new ITamperProtectionChannelBindingElement[] { new HmacSha1SigningBindingElement() },
        };
    IConsumerTokenManager _tokenManager;
    public TwitterClient(IConsumerTokenManager tokenManager)
    {
        _tokenManager = tokenManager;
    }
    public void StartAuthentication()
    {
        var request = HttpContext.Current.Request;
        using (var twitter = new WebConsumer(ServiceDescription, _tokenManager))
        {
            var callBackUrl = new Uri(request.Url.Scheme + "://" + request.Url.Authority + "/Members/TwitterCallback");
            twitter.Channel.Send(
                twitter.PrepareRequestUserAuthorization(callBackUrl, null, null)
            );
        }
    }
    public bool FinishAuthentication()
    {
        using (var twitter = new WebConsumer(ServiceDescription, _tokenManager))
        {
            var accessTokenResponse = twitter.ProcessUserAuthorization();
            if (accessTokenResponse != null)
            {
                UserName = accessTokenResponse.ExtraData["screen_name"];
                return true;
            }
        }
        return false;
    }
}

我在MembersController的构造函数中有以下内容它用正确的凭据实例化InMemoryTokenManager

_tokenManager = new InMemoryTokenManager(ConfigUtils.GetAppSetting("TwitterAppId"), ConfigUtils.GetAppSetting("TwitterAppSecret"));

我的两个动作是

    public ActionResult LogonTwitter()
    {
        var client = new TwitterClient(_tokenManager);
        client.StartAuthentication();
        return null;
    }
    public ActionResult TwitterCallback()
    {
        var client = new TwitterClient(_tokenManager);
        if (client.FinishAuthentication())
        {
            return new RedirectResult("/");
        }
        // show error
        return View("LogOn");
    }

错误出现在StartAuthentication()在我的TwitterClient。只要它调用

这一行

twitter.Channel.Send(
                twitter.PrepareRequestUserAuthorization(callBackUrl, null, null)
            );

我得到以下错误

Error occurred while sending a direct message or getting the response.
Inner Exception: The remote server returned an error: (401) Unauthorized.

谁有什么建议?我花了昨天和今天上午的大部分时间来整理这些东西。我尝试过的所有在线示例似乎也得到了401未经授权的回复?是否有一个已知的问题与DotNetOpenAuth和Twitter?

任何帮助都非常感谢。