Looking to setup a Windows Server 2012 R2 in a virtual machine. Basically we have an outside vendor that needs to access a machine within our network for various tasks. This vendor will have multiple users possible accessing the same VM at the same time through Remote Desktop.

Universal Termsrv.dll Patch Windows Server 2012 R2 Download
Termsrv Dll Patch Windows 10

Two of the known patches are KB4343891 for Windows 8.1/Server 2012 R2 and KB4343884 for Server 2016 (1607).These patches modify the terminal services file (termsrv.dll) which is responsible for remote desktop connection and may cause the RDP Wrapper invalid on the termsrv.dll file (the known termsrv.dll versions after patching are 6.3.9600.19093 for Windows 8.1/Server 2012 R2.
One of the Windows updates installed on 9th of July updated termsrv.dll file from version 6.3.9600.16384 to 6.3.9600.17095. File size also changed from 1,032,704 bytes to 1,018,880 bytes. This naturally broke the previous termsrv.dll patch. To restore concurrent RDP sessions, use any HEX editor and replace: 39 81 3C 06 00 00 0F 84 9E 31 05 00.
Describes an update for Universal C Runtime (CRT) in Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 8, Windows RT, Windows Server 2012, Windows 7 SP1, Windows Server 2008 R2 SP1, Windows Vista SP2, or Windows Server 2008 SP2.

Universal Termsrv.dll Patch Windows Server 2012 R2

In my last blog, we discussed “Installing Oracle 11g on Cloud (EC2 instance RHEL/Centos 6.x) through command line“.

Now it’s time for some Windows action. In this blog, we will discuss how we can “Enable multiple RDP sessions on Windows 2008 & 2012 R2”.

Whenever we do an installation of Windows host on AWS Cloud, by default we get 2 Administrative logins. But only 2 logins cannot be enough for a large enterprise, you will definitely need more than that.

So the question comes next is how to enable more administrative logins.

Let me give you a walk down of simple steps involved in enabling the same:

1) Go to Server Manager in the search option tab. Select Add Roles for installing the Remote Desktop Services Role.

2) After installing the role, reboot the instance for changes to take effect.

3) Now go to Administrative Tools à Remote Desktop Services à Remote Desktop Session Host Configuration

4) Locate “Restrict each user to a single session” and right click to find Properties.

5) Remove the tick from “Restrict each user to a single session” > Apply> OK.

6) Now select Connections RDP-Tcp & go to Properties.

7) In Properties, go to Network Adapter & specify the Maximum number of connections you would like to have e.g here I have taken the value as 10.

8) Go to Start > in the search/run box type regedit

Or Navigate to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal Server.

Now, locate the fSingleSessionPerUser value > Set it to 0 (Multiple sessions allowed)

9) Start > in the search/run box type gpedit.msc

10) Navigate to:
Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections

Locate the “Restrict Remote Desktop Services users to a single Remote Desktop Services session” setting.

11) Now go to Edit Policy Setting & set it to Disabled.

12) Now Reboot the server & it’s done.

Note : Multiple RDP sessions will only work for a default trial period of 120 days but in case you want them for a longer period, you need to purchase licenses to support the same.

Tag -

Enable multiple RDP sessionsEnable multiple RDP sessions on Windows 2008Enable multiple RDP sessions on Windows 2008 & 2012 R2Enable multiple RDP sessions on Windows 2012 R2

Option 1 - Modifying termsrv.dll

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:WindowsSystem32 folder. Before modifying termsrv.dllfor 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). You can do this yourself by replacing strings shown below, or just download patched versions from this page.

Windows 10 x64 v2004 - May 2020 Update (20H1)

After this update termsrv.dll is upgraded to version 10.0.19041.84 To get back concurrent remote desktop connections, make the following changes:

Find:

39 81 3C 06 00 00 0F 84 D9 51 01 00

replace with:

B8 00 01 00 00 89 81 38 06 00 00 90

The patched version can be download from here. The original, v10.0.19041.84 file can be found here.

Older Windows 10 versions

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Windows 10 x64 v1909 - November 2019 Update

After this update termsrv.dll is upgraded to version 10.0.18362.657. To get back concurrent remote desktop connections, make the following changes:

Find:

39 81 3C 06 00 00 0F 84 5D 61 01 00

replace with:

B8 00 01 00 00 89 81 38 06 00 00 90

The patched version can be download from here. The original, v10.0.17763.1 file can be found here.

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Windows 10 x64 v1903 - May 2019 Update

After this update termsrv.dll is upgraded to version 10.0.18362.53. To get back concurrent remote desktop connections, make the following changes:

Find:

39 81 3C 06 00 00 0F 84 5D 61 01 00

replace with:

B8 00 01 00 00 89 81 38 06 00 00 90

The patched version can be download from here. The original, v10.0.17763.1 file can be found here.

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Universal termsrv.dll patch windows server 2012 r2 download

Windows 10 x64 v1809 - October 2018 Update + Cumulative April 2019 Update

After this update termsrv.dll is upgraded to version 10.0.17763.437. To get back concurrent remote desktop connections, the make the following changes:

Find:

39 81 3C 06 00 00 0F 84 3B 2B 01 00

replace with:

B8 00 01 00 00 89 81 38 06 00 00 90

The patched version can be download from here. The original, v10.0.17763.437 file can be found here.

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Windows 10 x64 v1809 - October 2018 Update

Windows 10 October 2018 Update (1809) updates termsrv.dll to version 10.0.17763.1. To get back concurrent remote desktop connections, the make the following changes:

Find:

39 81 3C 06 00 00 0F 84 7F 2C 01 00

replace with:

B8 00 01 00 00 89 81 38 06 00 00 90

The patched version can be download from here. The original, v10.0.17763.1 file can be found here.

Universal Termsrv.dll Patch Windows Server 2012 R2