You can manually patch C:\Windows\System32\termsrv.dll using a hex editor (e.g., HxD).
For Server 2012 R2 (build 9600), you search for:
39 81 3C 06 00 00 0F 84
Replace with:
39 81 3C 06 00 00 0F 85
But this must be redone after every Windows Update. Not recommended due to maintenance hassle.
If you prefer a permanent modification to termsrv.dll itself, manual hex editing gives you the most control. This is the original "universal termsrvdll patch" method.
Without RDS CALs, Microsoft permits only two admins to manage the server remotely. For true multi-user environments (e.g., 10, 20, or 100 users running applications), you must purchase RDS CALs and install the Remote Desktop Session Host role.
After testing over a dozen methods (manual hex edits, automated patchers, scripted replacements), the best universal approach combines reliability, ease of use, and compatibility with all post-update builds.
Stuck with the 120-day grace period? Need concurrent RDP sessions without purchasing CALs for your test lab?
You’ve likely hit the dreaded “The remote session was disconnected because there are no Remote Desktop Licensing Servers available” error. The universal solution circulating in admin circles is the termsrv.dll patch.
Here is the cleanest, most reliable method to apply the universal termsrv.dll patch on Windows Server 2012 R2.
Edit rdpwrap.ini if needed to allow same-user multiple sessions:
Add or modify under [Server 2012 R2] section:
SingleSessionPerUser=0
Restart the Terminal Services service:
net stop TermService
net start TermService
Test by RDP-ing twice with the same user.
You can manually patch C:\Windows\System32\termsrv.dll using a hex editor (e.g., HxD).
For Server 2012 R2 (build 9600), you search for:
39 81 3C 06 00 00 0F 84
Replace with:
39 81 3C 06 00 00 0F 85
But this must be redone after every Windows Update. Not recommended due to maintenance hassle.
If you prefer a permanent modification to termsrv.dll itself, manual hex editing gives you the most control. This is the original "universal termsrvdll patch" method. universal termsrvdll patch windows server 2012 r2 best
Without RDS CALs, Microsoft permits only two admins to manage the server remotely. For true multi-user environments (e.g., 10, 20, or 100 users running applications), you must purchase RDS CALs and install the Remote Desktop Session Host role.
After testing over a dozen methods (manual hex edits, automated patchers, scripted replacements), the best universal approach combines reliability, ease of use, and compatibility with all post-update builds.
Stuck with the 120-day grace period? Need concurrent RDP sessions without purchasing CALs for your test lab? You can manually patch C:\Windows\System32\termsrv
You’ve likely hit the dreaded “The remote session was disconnected because there are no Remote Desktop Licensing Servers available” error. The universal solution circulating in admin circles is the termsrv.dll patch.
Here is the cleanest, most reliable method to apply the universal termsrv.dll patch on Windows Server 2012 R2.
Edit rdpwrap.ini if needed to allow same-user multiple sessions:
Add or modify under [Server 2012 R2] section: Replace with:
39 81 3C 06 00 00 0F 85
SingleSessionPerUser=0
Restart the Terminal Services service:
net stop TermService
net start TermService
Test by RDP-ing twice with the same user.