maximum remote desktop connections is 2, sounds like a time out issue. has all the remote patches been applied to the server?
If sessions have been disconnected with-out being logged off, the server may consider its concurrent connection limit reached even though there are not two human users connected at the time. An administrator might, for example, close a remote session without logging off. If two more administrators attempt to connect to the server, only one will be allowed to connect before the limit of two concurrent connections is reached.