Corrupted X509 certificates can prevent licensing. Deleting the Certificate X509 Certificate X509 Certificate ID X509 Certificate2 values under
Remote Desktop Services (RDS) Client Access Licenses (CALs) are essential for managing user and device connections in a Windows Server environment. When configuring an RDS licensing server, the Windows Registry serves as the central repository for critical licensing states, enforcement behaviors, and connection parameters. Understanding the precise location and function of the RDS CAL license registry keys is necessary for administrators seeking to troubleshoot licensing errors, reset grace periods, or force specific licensing modes. 1. The Core RDS CAL Registry Paths
To troubleshoot RDS CAL license registry key issues, follow these steps: rds cal license registry key
: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod Function : Controlling the 120-day licensing grace period. Contains a REG_BINARY entry beginning with the string L$RTMTIMEBOMB whose default permissions prevent modification. When to use : This key is modified primarily in test/lab environments when needing to reset the grace period after temporary licensing expires.
If a user receives errors like "The remote session was disconnected because the local computer client access license could not be upgraded or renewed," corrupt client-side keys are usually the cause. To clear and rebuild this cache: Open ( regedit.exe ) as an Administrator. Corrupted X509 certificates can prevent licensing
On the RD Session Host side, the operating system tracks how it discovers the licensing server and what mode it operates under. These settings are governed by specific registry keys, which are often mirrored or enforced via Group Policy Objects (GPOs). The TermService Parameters
Change the value data to 2 (for Per Device) or 4 (for Per User). Understanding the precise location and function of the
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 ).
Alternatively, you can run a simple command prompt as administrator: