Login info fails every time I open Visual Studio

Question

I get this every time I open Visual Studio 2013/2015 (premium):

TF400813: Resource not available for anonymous access. Client authentication required.

I can simply renter my credentials and everything works. But why do I have to do it every time?

Answer 1

The problem went away and I don't know why (Windows update?) I did not have the preview version installed at any point, so that was not the solution for me, although it probably is for others.

Answer 2

This problem occurs because the Visual Studio 2013 token cache is changing, and the cache is incompatible with the preview versions of Visual Studio 2013. To refresh the token, you have to reauthenticate. Check the link http://support.microsoft.com/kb/2892152 for more information.