Rds Cal License Registry Key [updated] Jun 2026

To get the most out of your RDS CALs and maintain a healthy RDS environment:

If a client machine receives a hardware upgrade (e.g., motherboard replacement), the Hardware ID changes. The cached license in the registry no longer matches the machine HWID. This results in the client being unable to connect.

Within these paths, values such as LicenseMode (DWORD) determine whether the server enforces Per Device or Per User licensing. Other subkeys store unique license IDs, version information, and – historically – even temporary license certificates. When an RDS client connects, the server checks these registry values to verify that a valid CAL is available.

The most common interaction with an RDS CAL license registry key happens on the client side. When a device connects to a Remote Desktop Session Host (RDSH) for the first time, it receives a license. .

Inside that new subkey, the presence of the key itself instructs the Remote Desktop service to query that specific network endpoint for available CALs. 5. Managing the RDS Grace Period Registry Key

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod Use code with caution.

If Group Policy is not applying correctly, manually changing the LicensingMode