Rds Cal License Registry Key -

In a perfect world, you would never touch these registry keys. However, real-world troubleshooting often forces an administrator’s hand. Common scenarios include:

| Component | Registry Path | |-----------|----------------| | RDS Licensing Server (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 |

Key values in Licensing Core:

Note: Per‑user CALs are tracked here too, but actual usage is stored in Active Directory or a database file (edb*.log in %SystemRoot%\System32\LServer).

Remote Desktop Services (RDS) is a cornerstone of Windows Server, enabling multiple users to connect to a centralized server environment. At the heart of its licensing mechanism lies the Remote Desktop Services Client Access License (RDS CAL) registry key. While this key is an essential technical component for tracking and enforcing license usage, it is also a frequent source of misconfiguration, troubleshooting, and even compliance risk. Understanding the role, location, and proper management of the RDS CAL registry key is critical for any system administrator seeking a stable and legally compliant RDS deployment. rds cal license registry key

Use only for non-production or temporary lab environments. Microsoft does not support this for production servers.

After a reboot, the server will typically show 120 days remaining. However, this is a temporary fix; you must install valid CALs to avoid permanent lockout. In a perfect world, you would never touch

The primary key for RDS CAL information is:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService\Parameters\LicenseKeyStore

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: LicenseServers (MULTI_SZ): List of license servers used by

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM

Within this key, you will find several important subkeys and values, including: