Replace the modified file with your .bak file and restart the TermService .

. A patch that works today may cause the RDP service to crash or fail to start after next Tuesday's update.

This is the core of our keyword: . It refers to the moment when Microsoft released an official cumulative update that specifically invalidated existing community patches and made further modification significantly harder.

The termsrv.dll file, located in the C:\Windows\System32 directory, is the core library responsible for managing Remote Desktop Services. In the Standard and Datacenter editions of Windows Server 2019, Microsoft implements a software lock within this DLL to limit the number of simultaneous connections. To officially support more than two concurrent users, Microsoft requires the installation of the role and the purchase of Client Access Licenses (CALs) . How the Patch Works

If you are looking to set this up for a , I can: Explain the standard way to install the RDS role.