Rds Cal License Registry Key
Once your RDS host obtains a CAL from a license server, it stores the token locally to avoid re-querying the license server for every user connection. This data resides under:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicensingCore\IssuedLicenses
Manipulating this key can resolve “blacklisted” or corrupted CAL entries.
WARNING: Incorrect registry edits can break RDS functionality and potentially destabilize the entire server. Always back up the registry and create a system restore point before proceeding. rds cal license registry key
Before touching the registry, you must understand where Windows stores its RDS licensing information.
The main registry key for RDS licensing is located under the HKLM (HKEY_LOCAL_MACHINE) hive. The specific path has changed slightly across different Windows Server versions, but for modern releases (Server 2012 R2, 2016, 2019, 2022, and 2025), the primary location is: Once your RDS host obtains a CAL from
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM
Within this key, you will find several important subkeys and values, including:
This report details the technical location, structure, and function of the Windows Registry keys used to store Remote Desktop Services (RDS) Per-Device Client Access Licenses (CALs). It is intended for system administrators and IT auditors responsible for license compliance, migration, and troubleshooting. Within this key
The report clarifies the distinction between the License Server Registry (where issued licenses are stored) and the Client Device Registry (where received tokens are cached).
Always back up the registry (export relevant keys or create a system restore point) before edits.
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