Managing RDS CALs via the Windows Registry is typically done to define licensing servers, set licensing modes, or reset the 120-day grace period. While Group Policy is the preferred management tool, these registry keys provide direct control over how a Session Host interacts with the License Server. Core RDS Licensing Registry Keys
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. rds cal license registry key
Backup MSLicensing: Before deleting the MSLicensing key on client machines to fix connection errors, right-click it and select Export. Managing RDS CALs via the Windows Registry is
*Note: Deleting the TimeBomb value requires taking ownership of the GracePeriod key first, as it is protected by SYSTEM permissions. Specific Troubleshooting Keys Other subkeys store unique license IDs, version information,
Reboot: A restart is required for this change to take effect and for the server to reach out to the specified license server. 4. Verify Activation
Effective management of RDS CAL license registry keys is crucial to ensure compliance, avoid licensing issues, and maintain a smooth RDS environment. Here are some best practices for managing RDS CALs: