Monday, February 27, 2017

How to Allow Multiple RDP Sessions in Windows 10

Like in previous client versions of Microsoft operation systems, Windows 10 Pro and Enterprise users can connect to their computers remotely using Remote Desktop service (RDP). There is a restriction on the number of simultaneous RDP sessions: only one remote user can work at a time. When you try to open a second RDP session, the session of the first user is prompted to be closed.
Another user is signed in. If you continue, they’ll be disconnected. Do you want to sign in anyway?
Another user is signed in. If you continue, they’ll be disconnected. Do you want to sign in anyway?
Actually, the number of simultaneous rdp connections is limited rather by the license, which does not allow to create an RDP server based on the workstation for use by several users, than by any technical aspect.
Tip. In Windows 10 Home editions, the incoming remote desktop connections are forbidden at all. The problem, however, can be solved using RDP Wrapper Library.
Let’s consider two ways how to eliminate the restriction of simultaneous RDP connections to Windows 10:
Note. System modifications described in the article will be probably treated as a violation of Microsoft License Agreement with all the consequences that come with it.

The Modification of termsrv.dll

The restriction on the number of RDP connections can be eliminated using termsrv.dll file (a library file used by Remote Desktop Services) modification. The file is located in C:\Windows\System32) directory.
Before termsrv.dll file modification, create its backup (if necessary, you can use the original version of the file):
copy c:\Windows\System32\termsrv.dll termsrv.dll_backup
backup original termsrv.dll
Before termsrv.dll file editing, you have to become its owner and give the Administrators group the full rights to it (all steps are similar to those described in the article “Enable Multiple Concurrent RDP Sessions in Windows 8”). After that, stop Remote Desktop service (TermService) in services.msc console or from the command prompt:
Net stop TermService
Stop TermService
For Windows 10 x64 RTM edition (termsrv.dll file version is 10.0.10240.16384):
Open termsrv.dll file using any HEX editor (for example, Tiny Hexer)
Find the line:
39 81 3C 06 00 00 0F 84 73 42 02 00
Replace it with:
B8 00 01 00 00 89 81 38 06 00 00 90
Tiny Hexer Editor
Save the file and run TermService.
The ready patched termsrv.dll file for Windows 10 Pro x64 can be downloaded here:

RDP Wrapper Library

The alternative to termsrv.dll file modification is the use of RDP Wrapper Library project. This software serves as a layer between SCM (Service Control Manager) and Terminal Services and allows not only to enable the support of several simultaneous RDP sessions but also to enable the support of RDP Host on Windows 10 Home editions. RDP Wrapper does not make any changes to termsrv.dll file, it just load termsrv with the changed parameters.
Thus, this solution will work even in case of termsrv.dll file update. It allows not to be afraid of Windows updates.
RDP Wrapper can be downloaded from GitHub repository: (the last version available is RDP Wrapper Library v1.6)
Tip. By the way, RDP Wrapper Library source code is also available. It means that if required, you can compile executables by yourself.
 Download RDPwrap-v1.6.1 here archive contains some files:
  • RDPWinst.exe — an RDP Wrapper Library install/uninstall program
  • RDPConf.exe — an RDP Wrapper configuration utility
  • RDPCheck.exe — Local RDP Checker — an RDP check utility
  • install.bat, uninstall.bat, update.bat — batch files for installation, uninstallation and update of RDP Wrapper
To install the utility, run install.bat with the Administrator privileges.
install RDP Wrapper Library
When the installation is over, run RDPConfig.exe. Make sure that all elements in Diagnostics section are green.
RDP Wrapper Configuration Utility
Try to open the second RDP session. It worked out well! Now, our Windows 10 allows two users to start RDP sessions simultaneously.
multiple RDP sessions on Windows 10


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