Multiple RDP (Remote Desktop) sessions in Windows 10
Option 1
To have concurrent user sessions working in Windows 10, you need to make small changes to termsrv.dll file. This file is located in C:\Windows\System32 folder. Before modifying termsrv.dll for the first time, you need to take ownership and assign yourself full permissions. You also need to stop Remote Desktop service (TermService) if it's running.
DLL files can be modified using any HEX Editor (for example Tiny Hexer). Instead of modifying the file yourself, you can download patched version from the link below.
Windows 10 x64 RTM (August 2015)
termsrv.dll file version 10.0.10240.16384.
In termsrv.dll find:
39 81 3C 06 00 00 0F 84 73 42 02 00
and replace it with:
B8 00 01 00 00 89 81 38 06 00 00 90
Patched version can be downloaded from here. Original, untouched version of termsrv.dll v10.0.10240.16384 can be downloaded from here.
Windows 10 x64 Threshold 2 (November 2015)
Windows 10 Fall Update (also called "Threshold Wave 2 Update") updates termsrv.dll to version 10.0.10586.0. To get back concurrent remote desktop connections, make following changes:
Find:
39 81 3C 06 00 00 0F 84 3F 42 02 00
replace with:
B8 00 01 00 00 89 81 38 06 00 00 90
Option 2
Instead of modifying termsrv.dll file you can use RDP Wrapper which acts as a middleman between Terminal Services and Service Control Manager. This way you don't need to touch termsrv.dll file. Actually, if you already modified your termsrv.dll file, you need to revert to the original version before using this method.
Download and extract RDPWrap-v1.6.zip (or newer), then run install.bat as admin. After installation is completed, run RDPConfig.exe. If all items under Diagnostics are green, you should be good to go.
If "Listener state" is "Listening [not supported]", you will need to update the wrapper's configuration (.ini) file.
The latest rdpwrap.ini file can be downloaded from the project's main GitHub page (file rdpwrap.ini is located in "res" folder). Tutorial on how to update the configuration (ini) file can be found on the same page.
With the latest version of RDP Wrapper you no longer need to update rdpwrap.ini manually. Simply run update.bat and everything will be done automatically.
Windows 10 x64 Threshold 2 (November 2015)
If Windows 10 Threshold 2 Update broke concurrent RDP sessions and RDPConfig.exe shows "Listening [not supported]", runupdate.bat which will automatically update rdpwrap.ini to support the latest version of termsrv.dll (10.0.10586.0).
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