How to Enable Concurrent Remote Desktop Sessions in Windows
Microsoft offers the Remote Desktop Protocol (RDP) in Windows to allow remote desktop connections, and while most versions of Windows include a RDP client, only the Professional, Ultimate and Server editions offer the RDP server to accept incoming connections.
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Unlike server editions of Windows, Microsoft limits the client editions of Windows to one concurrent user, whether remote or local. So if a remote desktop connection is made, no one physically at the PC can use it or even see the desktop without first kicking off the remote user.
However, we'll discuss how you can remove this limitation so that multiple users can log in simultaneously. Thus a remote user(s) can log in to their account while also allowing a local user to log in to their account when physically at the PC.
This limitation can be bypassed by applying an unofficial modification called the Universal Termsrv.dll Patch, which is provided by a developer who goes by the handle DeepXW:
- Download the Universal Termsrv.dll Patch and extract the ZIP file.
- Find the patch program you should run based upon your processor. For 32-bit (x86) it's UniversalTermsrvPatch-x86.exe and for 64-bit (amd64) it's UniversalTermsrvPatch-x64.exe.
NOTE: While the patch program will automatically create a backup of the Termsrv.dll file, to be cautious you can manually save a copy yourself. You'll find the file at \Windows\System32, and to undo the Registry changes it makes, you can save the .reg file that's included with the download and manually edit the Registry to remove the changes shown in the .reg file. For Windows XP you'll want to save the xp.reg file, and for Windows Vista and 7 its vista.reg.
- Right-click on the patch program and select to Run as administrator.
- On the program, click the Patch button and it will replace the Termsrv.dll file and perform the Registry modification. It will also save a backup so you can later undo the modification if desired.
- Next, restart your computer for the modification to take effect.
Now you just need to enable incoming remote desktop connections. Here's how to do so with Windows Vista or Windows 7:
- Right-click on Computer from the Start Menu and select Properties.
- Click Remote settings on the left.
- Under Remote Desktop, select one of the three options.
- Administrators on the computer will automatically be added to the list of remote users, but if you need to add standard users, click Select Users.
Windows should automatically configure Windows Firewall to allow the RDP traffic to pass through, but if you have a third-party firewall installed on the PC, you may have to manually configure it to allow the traffic.
As with normal remote desktop connections, remember that to remotely connect over the Internet you must configure your router to forward incoming RDP connections to the desired PC. And unless you perform other RDP settings modifications to change the RDP ports in the Windows Registry you're basically limited to configuring one PC on the network for incoming connections via the Internet.
Eric Geier is the founder of NoWiresSecurity, a cloud-based Wi-Fi security service, and On Spot Techs, an on-site computer services company. He is also a freelance tech writer — become a Twitterfollower or visit his Facebook Fan Page to keep up with his writings.
http://www.serverwatch.com/server-tutorials/how-to-enable-concurrent-remote-desktop-sessions-in-windows.html
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