An error occurred while making the HTTP request to visualstudiogallery.msdn.microsoft.com/Services/VStudio/Extension.svc. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be casued by a mismatch of the security binding between the client and the server.
The underlying connection was closed: An unexpected error occurred on a send.
Authentication failed because a remote party has closed the transport stream.