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The is a powerful but dangerous tool. While it offers a path to resolve stubborn licensing issues—from non-responsive license servers to corrupted grace periods—it must be handled with precision and respect for the underlying service architecture.
Click , change the Owner to the local Administrators group, and check "Replace owner on subcontainers and objects". Grant Full Control to the Administrators group.
For large-scale client-side MSLicensing issues, you can deploy a startup script or a Group Policy Object to delete the key automatically, ensuring the RDP application runs with elevated rights once to regenerate it.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core Use code with caution. : LicensingMode Data Types / Meanings : 2 = Per Device Mode 4 = Per User Mode 5 = Not Configured (Default out-of-box) License Server Discovery Key
(invoke-cimmethod -inputobject (get-ciminstance -namespace root/CIMV2/TerminalServices -classname Win32_TerminalServiceSetting) -methodname GetGracePeriodDays).DaysLeft
Within the Licensing Core key, look for a DWORD value named . You can alter this value to switch between the two primary RDS CAL models:
| Component | Registry Path | |-----------|----------------| | (Per User CAL issuance tracking) | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermServLicensing\Parameters\IssuedLicenses | | RDS Session Host (License mode & server assignment) | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core | | License server discovery | HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicenseServers |
Defines the license server IP/FQDN.
Windows didn't want them there. It protected that key with ironclad permissions. Sarah right-clicked, seized from the SYSTEM, and granted herself full control. With a final, decisive click, she deleted the binary blob sitting inside. "Now," Sarah said, "give it a heartbeat."
To explicitly point a Session Host to a specific RDS License Server, use this path:
Remote Desktop Services (RDS) Client Access License (CAL) Registry Key: A Complete Guide
wmic /namespace:\\root\CIMV2\TerminalServices PATH Win32_TerminalServiceSetting WHERE (__CLASS !="") CALL GetGracePeriodDays
Note: Changes to this key require a restart of the Remote Desktop Services service ( TermService ) to take effect. Best Practices and Safety Warnings
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services Microsoft Learn License Remote Desktop session hosts | Microsoft Learn
The is a powerful but dangerous tool. While it offers a path to resolve stubborn licensing issues—from non-responsive license servers to corrupted grace periods—it must be handled with precision and respect for the underlying service architecture.
Click , change the Owner to the local Administrators group, and check "Replace owner on subcontainers and objects". Grant Full Control to the Administrators group.
For large-scale client-side MSLicensing issues, you can deploy a startup script or a Group Policy Object to delete the key automatically, ensuring the RDP application runs with elevated rights once to regenerate it.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core Use code with caution. : LicensingMode Data Types / Meanings : 2 = Per Device Mode 4 = Per User Mode 5 = Not Configured (Default out-of-box) License Server Discovery Key rds cal license registry key
(invoke-cimmethod -inputobject (get-ciminstance -namespace root/CIMV2/TerminalServices -classname Win32_TerminalServiceSetting) -methodname GetGracePeriodDays).DaysLeft
Within the Licensing Core key, look for a DWORD value named . You can alter this value to switch between the two primary RDS CAL models:
| Component | Registry Path | |-----------|----------------| | (Per User CAL issuance tracking) | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermServLicensing\Parameters\IssuedLicenses | | RDS Session Host (License mode & server assignment) | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core | | License server discovery | HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicenseServers | The is a powerful but dangerous tool
Defines the license server IP/FQDN.
Windows didn't want them there. It protected that key with ironclad permissions. Sarah right-clicked, seized from the SYSTEM, and granted herself full control. With a final, decisive click, she deleted the binary blob sitting inside. "Now," Sarah said, "give it a heartbeat."
To explicitly point a Session Host to a specific RDS License Server, use this path: Grant Full Control to the Administrators group
Remote Desktop Services (RDS) Client Access License (CAL) Registry Key: A Complete Guide
wmic /namespace:\\root\CIMV2\TerminalServices PATH Win32_TerminalServiceSetting WHERE (__CLASS !="") CALL GetGracePeriodDays
Note: Changes to this key require a restart of the Remote Desktop Services service ( TermService ) to take effect. Best Practices and Safety Warnings
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services Microsoft Learn License Remote Desktop session hosts | Microsoft Learn