A few days ago, we had mysterious issues with one of our Windows Server 2008 R2 SP1 machines. The problem was noticed, because an information popped up in the system tray, of other terminal servers, that the Remote Desktop Licensing Service is not available on the network.
The source server of the problem was found pretty easy. After a troubeshooting for a while, i found out, that the problem-machine is not available via UNC-Path’s and Named Pipes.
If i tried: net use \\<troublemachine> from a remote system i received the error message, that the system is not available. So i searched for the service, that is responsible for providing this services, and this is the server service also known as LanmanServer.