Symptoms

Consider the following scenario:

  • You have a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1.

  • You connect the computer to a remote desktop by using Remote Desktop Protocol (RDP) 8.1 through a Remote Desktop Gateway (RD Gateway) server over User Datagram Protocol (UDP).

In this scenario, the remote desktop session constantly disconnects and reconnects.

Resolution

To resolve this issue, use one of the following methods to obtain and install the update. Notice that this update has prerequisites.

Method 1: Windows Update

This update is available from Windows Update.

Method 2: Microsoft Download Center

The following files are also available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 7

Download Download the package now.

All supported x64-based versions of Windows 7

Download Download the package now.

All supported x64-based versions of Windows Server 2008 R2

Download Download the package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

Prerequisites

To apply this update, you must be running Windows 7 SP1 or Windows Server 2008 R2 SP1 that has update 2830477 installed.
For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

Status

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

More Information

The global version of this update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Mstscax.dll

6.3.9600.17276

5,703,168

05-Sep-2014

01:52

x86

Mstscax.mof

Not applicable

2,055

26-Nov-2013

22:49

Not applicable

Rdvidcrl.dll

6.3.9600.16415

855,552

09-Jan-2014

02:22

x86

Tsgqec.dll

6.3.9600.16415

53,248

09-Jan-2014

02:22

x86

Mstscax.dll

6.3.9600.17276

5,703,168

05-Sep-2014

01:49

x86

Mstscax.mof

Not applicable

2,055

26-Nov-2013

22:44

Not applicable

Rdvidcrl.dll

6.3.9600.16415

855,552

09-Jan-2014

02:31

x86

Tsgqec.dll

6.3.9600.16415

53,248

09-Jan-2014

02:31

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Mstscax.dll

6.3.9600.17276

6,584,320

05-Sep-2014

02:11

x64

Mstscax.mof

Not applicable

2,055

26-Nov-2013

22:49

Not applicable

Rdvidcrl.dll

6.3.9600.16415

1,057,280

26-Nov-2013

22:49

x64

Tsgqec.dll

6.3.9600.16415

62,976

26-Nov-2013

22:49

x64

Mstscax.dll

6.3.9600.17276

6,584,320

05-Sep-2014

02:12

x64

Mstscax.mof

Not applicable

2,055

26-Nov-2013

22:49

Not applicable

Rdvidcrl.dll

6.3.9600.16415

1,057,280

26-Nov-2013

22:49

x64

Tsgqec.dll

6.3.9600.16415

62,976

26-Nov-2013

22:49

x64

Mstscax.dll

6.3.9600.17276

5,703,168

05-Sep-2014

01:52

x86

Mstscax.mof

Not applicable

2,055

26-Nov-2013

22:49

Not applicable

Rdvidcrl.dll

6.3.9600.16415

855,552

09-Jan-2014

02:22

x86

Tsgqec.dll

6.3.9600.16415

53,248

09-Jan-2014

02:22

x86

Mstscax.dll

6.3.9600.17276

5,703,168

05-Sep-2014

01:49

x86

Mstscax.mof

Not applicable

2,055

26-Nov-2013

22:44

Not applicable

Rdvidcrl.dll

6.3.9600.16415

855,552

09-Jan-2014

02:31

x86

Tsgqec.dll

6.3.9600.16415

53,248

09-Jan-2014

02:31

x86



For more information about the RD Gateway, go to the following Microsoft website:

General information about the Remote Desktop Gateway

For more information about a similar issue, see RDP session is unstable when it uses UDP in Windows 8.1 or Windows Server 2012 R2.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

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