You might need to deactivate a Remote Desktop license server when the certificate of the server has expired or becomes corrupted, or when the server is being redeployed. When you deactivate a Remote Desktop license server, the license server is not able to issue permanent Remote Desktop Services Per Device client access licenses (RDS Per Device CALs) to additional clients until the license server is activated again. However, a deactivated license server is able to issue RDS Per User CALs and temporary RDS Per Device CALs.
You can deactivate a license server by using one of the following methods:
Deactivate a Remote Desktop License Server Automatically
Deactivate a Remote Desktop License Server by Using the Telephone
You cannot deactivate a Remote Desktop license server by using the Web browser connection method.