TF205020: Could not connect to server {0}'. This server was used in your last session, but it might be offline or unreachable. ...

TF205020: Could not connect to server ‘{0}'. This server was used in your last session, but it might be offline or unreachable. Confirm that the server is available on the network. To attempt to connect again, or to a different server, click ‘Connect To Team Foundation Server' in Team Explorer or the Team menu.

The server returned the following error: {1}