Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core Modify or create the DWORD value named : Set to 2 for Per Device mode. Set to 4 for Per User mode.
: Right-click any key you intend to change or delete and select Export to create a backup .reg file.
The RDS CAL license registry key is a small but mighty component of Windows Server’s Remote Desktop Services infrastructure. It holds the configuration that determines how hundreds or thousands of users connect to critical applications. While it is technically possible to view and modify this key directly, doing so without proper understanding invites disaster – from broken remote access to licensing noncompliance. Wise administrators respect the registry key as an internal database, not a user interface. By leveraging official management tools and maintaining disciplined licensing records, they ensure that RDS remains both functional and lawful. In the end, the registry key is best left undisturbed, serving its silent purpose behind the scenes. rds cal license registry key
One of the most frequent reasons administrators look for the RDS CAL registry key is to address an expired grace period error, such as: "The remote session was disconnected because there are no Remote Desktop License Servers available to provide a license."
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod Target Entry : A binary entry starting with L$RTMTIMEBOMB Steps to Reset Take Ownership : Right-click the GracePeriod folder, select Permissions , and change the to the local "Administrators" group. Grant Permissions Full Control to the "Administrators" group. Delete Key : Right-click the The RDS CAL license registry key is a
This registry key tells the RD Session Host whether to look for or Per Device CALs.
While the preferred method to set your RDS licensing mode (Per User or Per Device) is through Group Policy (GPO) or Server Manager, you can force these configurations directly via the registry. This is highly useful for standalone servers or automated deployments. Navigate to: Wise administrators respect the registry key as an
Back in the Permissions window, select the Administrators group and check the box to allow . Click OK .
On the RDS server itself, the registry is where administrators can verify and force critical operational states when the GUI tools are unresponsive.
You can also use the Microsoft Learn guide to verify if the server is properly configured via PowerShell as an alternative to registry edits. 3. Clear Cached Grace Period (Troubleshooting)
