title: Owin Twitter login - the remote certificate is invalid according to the validation procedure
body: <p>I started getting this error recently when trying to login using twitter- any idea why?</p>
  
  <pre><code>Stack Trace: 
  
  
  [AuthenticationException: The remote certificate is invalid according to the validation procedure.]
     System.Net.TlsStream.EndWrite(IAsyncResult asyncResult) +230
     System.Net.PooledStream.EndWrite(IAsyncResult asyncResult) +13
     System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar) +123
  
  [WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.]
     System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) +6432446
     System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar) +64
  </code></pre>