title: Visual Studio Team Explorer lost Git authorization for Visual Studio Online
body: <p>When I try to communicate with the remote repo (fetch, push, pull), I just get this exception:<br>
  TF400813: Resource not available for anonymous access. Client authentication required.</p>
  
  <p>I can do the same using GitExt or git bash without problems, so it seems like it's just VS that lost some setting. I can't find anywhere to "re-authenticate" or similar, though. I do have basic credentials set up, and am signed in with the same live id in Visual Studio.</p>