The MSDN/TechNet/Private forums are currently not available via the bridge. For more info see:

Forum-Post

We have recently been experiencing some stability issues in the forums related to the NNTP Bridge and the web service it uses. For the time being the web service has been disabled until we can further investigate the issues and develop solutions. There is no need to report errors from the bridge until this issue is resolved. I will reply to this thread daily with status updates until the issue is resolved or further action is defined. Thanks for your patience.