Microsoft Server 2012 R2 RDS license For Remote desktop we only possible to take two user at the same time in 2012 R2 one as user and another one as administrator Only with cal license we are possible to take multiple remote session in simultaneously For First install of RDS we get a free trail for 120 days to access multiple session After 120 days again we need to get a free trail don't need to format the server , its not possible For small trick to get back again 120 days with small changes in registry Windows + R to open run Type regedit find the location of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod Just Delete the entries in the registry , if it not possible give the full permission to access the file first don't delete the default one , Just leave it Restart the system and again made RDS install get back your free 120 days trail
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