We are using TFS2010 with the SharePoint document portal. We are trying to access the files in SharePoint using UNC paths (e.g. \tfs2010\sites\DefaultCollection\MyProject) and it just plain doesn't work. From my workstation, I actually get different behaviours depending on the path. Case 1: Path = \tfs2010\sites\DefaultCollection\MyProject\ Result: windows explorer reports a network error "Windows cannot access \tfs2010\sites\DefaultCollection\MyProject\" Case 2: Path = \tfs2010.mycompany.com\sites\DefaultCollection\MyProject\ Result: Windows Security dialog pops up asking for my username and password. I tried entering all combinations of my windows username and password (with and without the domain before the username), but no matter what, my credentials are not accepted. I have no problems accessing the SharePoint site through the web portal - it's just UNC which doesn't work. There doesn't seem to be anything relevant in the event viewer on the server. Anyone have any idea what could be the problem?