For TFS 2010 Beta 1, Resolving TF31001 "The ServicePointManager does not support proxies with the https scheme."

http://blogs.msdn.com/ablock/archive/2009/05/20/for-tfs-2010-beta-1-resolving-tf31001-the-servicepointmanager-does-not-support-proxies-with-the-https-scheme.aspx