Specific machines might fail to connect to Team Foundation Service with the error: "TF400813: Resource not available for anonymous access. Client authentication required".
The error like this appears in the application log:
TFSServer.ConnectToServer() : EXCEPTION! (see below) Situation: Exception connecting to TFS server Outer Exception Type: Microsoft.TeamFoundation.TeamFoundationServiceUnavailableException Message: Team Foundation services are not available from server [url]. Technical information (for administrator): TF400813: Resource not available for anonymous access. Client authentication required.