Delete the following key which will force client to obtain new license from server.
To reset the 90 day grace period on the Terminal Server Licensing Server perform the following steps:
net stop TermServLicensing
%windir%\system32\LServer to %windir%\system32\LServer.old
Make a new empty directory in
net start TermServLicensing
Each CAL is valid for between 52 and 89 days, the number of days is determined randomly when the CAL is issued. When a CAL is due to expire in 7 days the TS server will attempt to renew it, again, for between 52 and 89 days. If it cannot connect to the license server it will attempt to renew the CAL each time the client logs on. When a CAL expires it is returned to the pool of available licenses. This helps the license server to automatically recover Per Device CALs that are lost when the device is no longer in use or when its operating system is reinstalled. If the license server itself is lost then you should try to recover it using the most recent backup. If no backup is available then you must reinstall the server, reactivate it, and contact the license clearinghouse to have them issue replacement CALs.