Rds Cal License Registry Key [new]

When you deploy a new RD Session Host, Windows provides a 120-day grace period during which users can connect without a licensing server. Once this expires, connections are blocked with licensing errors. Administrators often reset this clock during migrations or extended testing phases. Step-by-Step Grace Period Reset Open the Registry Editor ( regedit.exe ) as an . Navigate to the following path:

(Note: registry locations differ by Windows version and role state; below are commonly encountered paths on Windows Server editions.)

(Per User vs. Per Device) is not correctly set in the registry. Microsoft Learn

The most frequent mistake is setting the LicensingMode value incorrectly. For instance, if you have installed Per Device CALs but configure the registry for Per User (setting value to 4), the server will fail to issue licenses, and users will encounter connection errors.

: Contains unique hardware identification data for the client machine. rds cal license registry key

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The client stores this licensing token locally in its system registry. The registry key acts as a local vault, proving to the RDS Session Host during subsequent connections that the device is legally authorized to establish a session. Registry Key Locations

With the release of Windows Server 2025, Microsoft has continued to enforce strict version compatibility for RDS CALs. Windows Server 2025 RDS CALs cannot be downgraded to earlier versions (such as 2019 or 2022), nor can they be used to license older session hosts. Conversely, older RDS CALs cannot license Windows Server 2025 session hosts. When planning upgrades, ensure you purchase the correct CAL version for your target server version.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod When you deploy a new RD Session Host,

: Navigate to HKLM\SYSTEM\CurrentControlSet\Services\TermService\Parameters\LicenseServers and ensure SpecifiedLicenseServers contains the FQDN of your activated license server. If missing, create the MultiString value.

HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core LicensingMode (Per Device) or (Per User). Specified License Servers : Lists the addresses of the servers that issue the CALs.

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Locate or create a DWORD (32-bit) Value named . Set the value data based on your licensing architecture: Value Data Licensing Mode Description 2 Per Device Step-by-Step Grace Period Reset Open the Registry Editor

Common subkeys/values under RCM:

When a client device connects to an RDS Session Host, the server issues a temporary or permanent CAL. This license is stored directly on the client machine's registry. The MSLicensing Key

and :