Similarly to this question I have a project on Codeplex and when I attempt to connect to the Codeplex TFS server in Visual Studio 2012 (on windows 8) I get a 407 'proxy authentication' server error.
My company does use a proxy server but I could previously connect to the Codeplex TFS server with Visual Studio 2010 on windows 7.
I have tried refreshing the start page as suggested in the linked question but this has no effect. Are there any other options to get connected to TFS?
To duplicate run VS2012 Premium in W8 click Team > Connect to Team Foundation Server, Click 'Servers...' then 'Add...', enter 'https://tfs.codeplex.com:443/tfs/TFS03' in the first textbox then click OK. Error TF31002 popup appears.