Recently we started having trouble connecting to an RDP server (WinServer 2012) that has been working normally for at least four months now. There are about five to ten users connecting to it every day, and sometimes for some of them the connection hangs at "estimating connection quality" for a couple of minutes and then a window pops up saying "a licensing error occurred while the client was attempting to connect (licensing timed out)", sometimes it just hangs for a couple of minutes, and then connects and works normally, and sometimes a user gets disconnected from the session for no apparent reason.
The problem can go away after a server restart, or after we restart the machine that's trying to connect to the server, but restart doesn't always help, and I can't figure out the connection.
In the Server Manager under Remote Desktop Services I found an error:
"The Remote Desktop license server could not be registered as a service connection point in Active Directory Domain Services (AD DS). Ensure that there is network connectivity between the license server and AD DS. To register the license server as a service
connection point in AD DS, use ReviewConfiguration in the RD Licensing Manager tool.
We have only one server, so all the licensing is set up on the same server. In the Review Configuration window it says "The license server is registered as a service connection point..."
I spent a lot of time googling but none of the solutions I found seem to work for us
I can't figure out even to look for the root of the problem.