takes a different approach: instead of modifying termsrv.dll on disk, it injects a wrapper DLL ( rdpwrap.dll ) that hooks into the terminal services functions and modifies their behaviour in memory. This method does not permanently change system files, which can be advantageous when dealing with Windows Updates.
Install legitimate Per-User or Per-Device Remote Desktop Services Client Access Licenses (RDS CALs).
If you need to enable more than two RDP sessions on Windows Server 2019, the best course of action is the official route:
Instead of risking server stability and legal compliance, consider the following standard methods for managing RDP connections: 1. Enable the RDSH Role windows server 2019 termsrvdll patch top
There is also a significant risk of "bricking" your remote access. If the patch is applied to the wrong Windows build or a corrupted byte pattern is written, the server may fail to start the Remote Desktop service. As seen in Microsoft Q&A threads, users have reported getting stuck at the login screen or facing a "Remote Procedure Call Failed" error, rendering the server unreachable via RDP.
Administrators looking to expand concurrent RDP sessions typically utilize three primary methodologies. 1. RDP Wrapper Library (Universal Wrapper)
Confirm any prompt regarding dependent services (such as Remote Desktop Services UserMode Port Redirector). Step 4: Modify the Hexadecimal Sequences takes a different approach: instead of modifying termsrv
: Modifying system files may breach Microsoft's Terms of Service and can introduce system instability or vulnerabilities. Method 1: Manual HEX Patching
The allows administrators to bypass default Remote Desktop Protocol (RDP) limits to enable multiple simultaneous user sessions without purchasing expensive Remote Desktop Services (RDS) Client Access Licenses (CALs). Out of the box, Windows Server 2019 restricts connections to exactly two concurrent administrative sessions . If a third user attempts to log in via RDP, the system prompts them to disconnect one of the existing active sessions.
Before diving into patches, it is crucial to understand exactly what you are bypassing. Windows Server 2019 Remote Desktop Services (RDS) has a very specific default behavior: If you need to enable more than two
The Official Alternative: Configuring RDS on Windows Server 2019
: Modifying system files can cause instability or prevent Windows from booting if done incorrectly.
Key security considerations include:
Navigate to: Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections .