Consider the following scenario:
You have two or more Windows Server 2012-based computers that run as remote desktop license servers.
You configure Per Device licensing mode on a Remote Desktop Session Host (RD Session Host) server.
You try to access an RD Session Host server from a client computer by using Remote Desktop Protocol (RDP).
In this scenario, the license servers freeze, and the connection to the RD Session Host server is lost.
To resolve this issue, install update rollup 2984005. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2984005 September 2014 update rollup for Windows RT, Windows 8, and Windows Server 2012
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates