"Look here," she pointed to the key. "It’s set to 5 . That’s the ghost code. It doesn't know if it wants Per User or Per Device."
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing .
To clean the client's license cache (useful when license tokens become corrupted), follow these steps:
The primary registry keys for managing Remote Desktop Services (RDS) Client Access Licenses (CALs) are used to configure the licensing mode and specify the license server. Core RDS Licensing Registry Keys Licensing Mode : Defines "Per User" ( ) or "Per Device" ( ) settings. rds cal license registry key
: Configures Per Device (2) or Per User (4) via HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core .
Within this path, administrators look for specific attributes regarding licensing validation periods and session limits, ensuring the host communicates correctly with the environment's domain controllers and certificate authorities. 3. Configuring RDS Licensing Mode via Registry
: A DWORD value determining how the server handles CALs. 2 = Per-Device Mode 4 = Per-User Mode 5 = Not configured / Workgroup Default 2. The Local Machine Grace Period Key "Look here," she pointed to the key
The Windows Registry does not typically store the actual RDS CAL (Remote Desktop Services Client Access License) in a plain-text format that can be easily copied or transferred. Instead, the registry stores the and licensing identifiers that verify the license's validity with the Microsoft Clearinghouse.
If you need the Windows Registry location used by Remote Desktop Services Client Access Licenses (RDS CALs), the relevant key for the Remote Desktop Licensing Grace Period and licensing configuration is:
Sometimes group policies fail, and you need to force an RD Session Host to look at a specific licensing server. You can verify or set this manually in the registry. It doesn't know if it wants Per User or Per Device
To ensure compliance, you need to track CAL usage. The RDS Licensing Manager allows you to generate reports to view which users or devices have been issued licenses Microsoft Learn .
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