Termsrv.dll Patch Windows Server 2016 Jun 2026

Download a reputable, free hex editor (such as HxD) to perform the modification. The exact bytes to change depend on your Windows Server 2016 build version.

Modifying system DLLs carries inherent risks. Always create a full backup or system restore point before proceeding. This guide is for educational purposes and assumes you have the necessary administrative rights. If you are using Windows Server in a production environment, it is highly recommended to purchase legitimate Remote Desktop Services (RDS) CALs instead of patching system files.

Disclaimer: This article is for educational purposes only. The author and publisher are not responsible for any damage, data loss, or licensing violations resulting from the use of this information. Always adhere to Microsoft’s licensing terms and software agreements.

Tools like RDP Wrapper Library attempt to dynamically configure RDP limits without permanently patching the DLL. They often fail after Windows updates. termsrv.dll patch windows server 2016

Windows Server 2016, by default, allows only two simultaneous administrative remote connections. This is by design—Microsoft intends this for light server management, not for multi-user access scenarios. However, in lab environments, development servers, legacy application hosting, or even small businesses on a budget, the need for more than two concurrent users arises frequently.

Run .\TermsrvPatcher.ps1 with Administrator privileges.

: Microsoft updates routinely replace modified system files with factory versions. Download a reputable, free hex editor (such as

: Future Windows updates can overwrite the patched file, causing RDP to fail.

I can provide the exact hex values or automation steps for your specific system. Share public link

: Typically, a hex editor or script is used to find a specific pattern of bytes—such as 39 81 3C 06 00 00 —and replace them with a sequence like B8 00 01 00 00 89 81 38 06 00 00 90 . Always create a full backup or system restore

This typically indicates that the DLL has become corrupted or that the wrong byte pattern was applied.

: Download a reliable hex editor like HxD if you plan to modify the file manually. Step-by-Step Guide to Patching termsrv.dll

By default, Windows Server 2016 allows only one active Remote Desktop session per user (or two administrative sessions). This patch modifies the termsrv.dll file to remove the single-session limit, allowing multiple concurrent RDP sessions with the same or different user accounts without a proper RDS License Server.

For testing, lab, or development environments, administrators often patch the termsrv.dll file to bypass this connection limit. This article explains how the patch works, how to apply it, and the risks involved. Understanding termsrv.dll and the RDP Limit

The exact hex values depend on the specific build version of your Windows Server 2016 installation. Open your hex editor (e.g., HxD) as an Administrator. Open the file C:\Windows\System32\termsrv.dll .