Copy the original, unmodified DLL to a safe location so you can restore it if the system crashes:
If you want to explore setting up concurrent access safely, tell me: universal termsrv.dll patch windows server 2012 r2
You must log in with full Administrator privileges. Copy the original, unmodified DLL to a safe
Windows Server 2012 R2 is a robust platform for hosting business applications, but its default Remote Desktop Services (RDS) configuration comes with a significant limitation for small businesses: it restricts concurrent Remote Desktop Protocol (RDP) sessions. Out of the box, the operating system allows only two simultaneous administrative connections. If a third user attempts to log in, an existing user is forced off the system. If a third user attempts to log in,
Windows protects core system files by assigning ownership to TrustedInstaller . You must change permissions to modify it. Open File Explorer and navigate to C:\Windows\System32\ . Locate termsrv.dll , right-click it, and select . Go to the Security tab and click Advanced .
Download a reputable version of the Universal Termsrv.dll Patcher (often designed by user "Deepxw"). For 64-bit Windows Server 2012 R2, you need the . 3. Run the Patcher as Administrator
On Windows Server 2012 R2 (x64), specific hex signatures are targeted. For example, older versions of the patch utilized patterns such as 39 81 3C 06 00 00 0F 84 3F 42 02 00 . The patch replaces this with B8 00 01 00 00 89 81 38 06 00 00 90 . For more specific builds like version 6.3.9600.17095 , the technical community identified replacements like 39813C0600000F849E310500 being replaced by B80001000089813806000090 . These modifications effectively set the session count value to an arbitrary high number, bypassing the lock.