Rds Cal License Registry Key May 2026

The registry keys for Remote Desktop Services (RDS) Client Access Licenses (CALs)

• LicensingMode (REG_DWORD):
  • <LSID> is a unique identifier for the specific license server installation.
  • This location holds the license server's certificate and the inventory of available CALs purchased (via Microsoft Open License, etc.).
  • Note: This is not typically where an administrator "finds" the license key (e.g., the 25-character product key). The product key is generally kept in the Volume License Service Center (VLSC) or entered during the activation process, not stored in plain text in the registry.

  The Purpose and Location of the Registry Key

  The RDS CAL registry key is not a direct license file but rather a storage location for licensing-related configuration and, in certain legacy or specific scenarios, license token information. Its primary role is to inform the RDS server about the licensing mode (Per User or Per Device) and, on a license server, to track issued CALs. The most critical keys reside in the Windows Registry under: rds cal license registry key

  When a device connects to an RDS host, the host issues a digital token (CAL) to the client machine. This is stored locally on the user's computer at: HKEY_LOCAL_MACHINE\Software\Microsoft\MSLicensing The registry keys for Remote Desktop Services (RDS)

  Date: October 26, 2023 Subject: Analysis of Remote Desktop Services (RDS) Client Access License (CAL) Registry Keys LicensingMode (REG_DWORD):

  They navigated to:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod "The gatekeeper key," Leo muttered.

  • Symptom: User receives an error stating a license could not be issued, often referencing a registry write failure.
  • Resolution: Verify that the Users group or the specific user account has Read and Write permissions on the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing key and its subkeys.