Symptoms
Consider the following scenario:
-
You have a computer that is running Windows Server 2008 R2 or Windows 7.
-
You run an application that uses the Remote Desktop Connection ActiveX control (Mstscax.dll) to provide virtualized sessions.
-
Multiple user accounts are running applications in the virtualized sessions provided by the application.
In this scenario, the application crashes, and all virtualized sessions are disconnected.Note This issue also occurs in Windows MultiPoint Server 2010. The SRCShell.exe in Windows MultiPoint Server 2010 uses Mstscax.dll to provide virtualized sessions. After this issue occurs, the SRCShell.exe crashes.
Cause
This issue occurs because an access violation exception occurs in the application that provides virtualized sessions when uninitialized variables are accessed. The uninitialized variables occur because the Desktop Windows Manager (DWM) is disabled on the remote desktop server when an application on the server opens a virtual channel to the DWM proxy on the client.Note The Remote Desktop Protocol (RDP) enables virtual channels between a server and a client to transfer specific information. The clipboard, the remote audio, and the DWM all use this mechanism to relay information on the server to their proxies that are located on the client.
Resolution
Hotfix information
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:
http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Prerequisites
To apply this hotfix, you must be running one of the following operating systems:
-
Windows 7
-
Windows 7 Service Pack 1 (SP1)
-
Windows Server 2008 R2
-
Windows Server 2008 R2 Service Pack 1 (SP1)
Registry information
To use the hotfix in this package, you do not have to make any changes to the registry.
Restart requirement
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
File information
The global version of this hotfix 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.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
-
The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
Version
Product
SR_Level
Service branch
6.1.7600.20xxx
Windows 7 and Windows Server 2008 R2
RTM
LDR
6.1.7601.17xxx
Windows 7 and Windows Server 2008 R2
SP1
GDR
6.1.7601.21xxx
Windows 7 and Windows Server 2008 R2
SP1
LDR
-
GDR service branches contain only those fixes that are widely released to address widespread, very important issues. LDR service branches contain hotfixes in addition to widely released fixes.
-
The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
|
File name |
File version |
File size |
Date |
Time |
Platform |
|---|---|---|---|---|---|
|
Mstsc.exe |
6.1.7600.20861 |
1,034,752 |
18-Dec-2010 |
05:25 |
x86 |
|
Mstsc.mof |
Not applicable |
1,199 |
22-Jul-2009 |
23:03 |
Not applicable |
|
Mstsc.exe |
6.1.7601.21624 |
1,049,600 |
18-Dec-2010 |
07:56 |
x86 |
|
Mstsc.mof |
Not applicable |
1,199 |
12-Nov-2010 |
23:41 |
Not applicable |
|
Aaclient.dll |
6.1.7600.20861 |
131,584 |
18-Dec-2010 |
05:25 |
x86 |
|
Aaclient.mof |
Not applicable |
1,261 |
22-Jul-2009 |
22:58 |
Not applicable |
|
Mstscax.dll |
6.1.7600.20861 |
2,705,408 |
18-Dec-2010 |
05:29 |
x86 |
|
Mstscax.mof |
Not applicable |
2,054 |
22-Jul-2009 |
23:02 |
Not applicable |
|
Tsgqec.dll |
6.1.7600.20861 |
36,864 |
18-Dec-2010 |
05:30 |
x86 |
|
Aaclient.dll |
6.1.7601.17514 |
131,584 |
20-Nov-2010 |
12:18 |
x86 |
|
Aaclient.mof |
Not applicable |
1,261 |
10-Jun-2009 |
21:14 |
Not applicable |
|
Mstscax.dll |
6.1.7601.21624 |
3,215,872 |
18-Dec-2010 |
07:57 |
x86 |
|
Mstscax.mof |
Not applicable |
2,054 |
10-Jun-2009 |
21:17 |
Not applicable |
|
Tsgqec.dll |
6.1.7601.17514 |
36,864 |
20-Nov-2010 |
12:21 |
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 |
|---|---|---|---|---|---|
|
Mstsc.exe |
6.1.7600.20861 |
1,098,752 |
18-Dec-2010 |
06:04 |
x64 |
|
Mstsc.mof |
Not applicable |
1,199 |
22-Jul-2009 |
23:22 |
Not applicable |
|
Mstsc.exe |
6.1.7601.21624 |
1,116,672 |
18-Dec-2010 |
08:50 |
x64 |
|
Mstsc.mof |
Not applicable |
1,199 |
12-Nov-2010 |
23:42 |
Not applicable |
|
Aaclient.dll |
6.1.7600.20861 |
158,720 |
18-Dec-2010 |
06:04 |
x64 |
|
Aaclient.mof |
Not applicable |
1,261 |
22-Jul-2009 |
23:18 |
Not applicable |
|
Mstscax.dll |
6.1.7600.20861 |
3,155,968 |
18-Dec-2010 |
06:08 |
x64 |
|
Mstscax.mof |
Not applicable |
2,054 |
22-Jul-2009 |
23:20 |
Not applicable |
|
Tsgqec.dll |
6.1.7600.20861 |
44,032 |
18-Dec-2010 |
06:09 |
x64 |
|
Aaclient.dll |
6.1.7601.17514 |
158,720 |
20-Nov-2010 |
13:25 |
x64 |
|
Aaclient.mof |
Not applicable |
1,261 |
10-Jun-2009 |
20:31 |
Not applicable |
|
Mstscax.dll |
6.1.7601.21624 |
3,715,584 |
18-Dec-2010 |
08:51 |
x64 |
|
Mstscax.mof |
Not applicable |
2,054 |
10-Jun-2009 |
20:34 |
Not applicable |
|
Tsgqec.dll |
6.1.7601.17514 |
44,032 |
20-Nov-2010 |
13:27 |
x64 |
|
Mstsc.exe |
6.1.7600.20861 |
1,034,752 |
18-Dec-2010 |
05:25 |
x86 |
|
Mstsc.mof |
Not applicable |
1,199 |
22-Jul-2009 |
23:03 |
Not applicable |
|
Mstsc.exe |
6.1.7601.21624 |
1,049,600 |
18-Dec-2010 |
07:56 |
x86 |
|
Mstsc.mof |
Not applicable |
1,199 |
12-Nov-2010 |
23:41 |
Not applicable |
|
Aaclient.dll |
6.1.7600.20861 |
131,584 |
18-Dec-2010 |
05:25 |
x86 |
|
Aaclient.mof |
Not applicable |
1,261 |
22-Jul-2009 |
22:58 |
Not applicable |
|
Mstscax.dll |
6.1.7600.20861 |
2,705,408 |
18-Dec-2010 |
05:29 |
x86 |
|
Mstscax.mof |
Not applicable |
2,054 |
22-Jul-2009 |
23:02 |
Not applicable |
|
Tsgqec.dll |
6.1.7600.20861 |
36,864 |
18-Dec-2010 |
05:30 |
x86 |
|
Aaclient.dll |
6.1.7601.17514 |
131,584 |
20-Nov-2010 |
12:18 |
x86 |
|
Aaclient.mof |
Not applicable |
1,261 |
10-Jun-2009 |
21:14 |
Not applicable |
|
Mstscax.dll |
6.1.7601.21624 |
3,215,872 |
18-Dec-2010 |
07:57 |
x86 |
|
Mstscax.mof |
Not applicable |
2,054 |
10-Jun-2009 |
21:17 |
Not applicable |
|
Tsgqec.dll |
6.1.7601.17514 |
36,864 |
20-Nov-2010 |
12:21 |
x86 |
For all supported IA-64-based versions of Windows Server 2008 R2
|
File name |
File version |
File size |
Date |
Time |
Platform |
|---|---|---|---|---|---|
|
Mstsc.exe |
6.1.7600.20861 |
1,661,952 |
18-Dec-2010 |
05:13 |
IA-64 |
|
Mstsc.mof |
Not applicable |
1,199 |
22-Jul-2009 |
23:47 |
Not applicable |
|
Mstsc.exe |
6.1.7601.21624 |
1,696,256 |
18-Dec-2010 |
09:34 |
IA-64 |
|
Mstsc.mof |
Not applicable |
1,199 |
12-Nov-2010 |
23:42 |
Not applicable |
|
Aaclient.dll |
6.1.7600.20861 |
339,968 |
18-Dec-2010 |
05:13 |
IA-64 |
|
Aaclient.mof |
Not applicable |
1,261 |
22-Jul-2009 |
23:44 |
Not applicable |
|
Mstscax.dll |
6.1.7600.20861 |
6,091,776 |
18-Dec-2010 |
05:17 |
IA-64 |
|
Mstscax.mof |
Not applicable |
2,054 |
22-Jul-2009 |
23:46 |
Not applicable |
|
Tsgqec.dll |
6.1.7600.20861 |
97,792 |
18-Dec-2010 |
05:19 |
IA-64 |
|
Aaclient.dll |
6.1.7601.21624 |
339,968 |
18-Dec-2010 |
09:35 |
IA-64 |
|
Aaclient.mof |
Not applicable |
1,261 |
10-Jun-2009 |
20:36 |
Not applicable |
|
Mstscax.dll |
6.1.7601.21624 |
6,301,696 |
18-Dec-2010 |
09:35 |
IA-64 |
|
Mstscax.mof |
Not applicable |
2,054 |
10-Jun-2009 |
20:38 |
Not applicable |
|
Tsgqec.dll |
6.1.7601.17514 |
97,792 |
20-Nov-2010 |
10:28 |
IA-64 |
|
Mstsc.exe |
6.1.7600.20861 |
1,034,752 |
18-Dec-2010 |
05:25 |
x86 |
|
Mstsc.mof |
Not applicable |
1,199 |
22-Jul-2009 |
23:03 |
Not applicable |
|
Mstsc.exe |
6.1.7601.21624 |
1,049,600 |
18-Dec-2010 |
07:56 |
x86 |
|
Mstsc.mof |
Not applicable |
1,199 |
12-Nov-2010 |
23:41 |
Not applicable |
|
Aaclient.dll |
6.1.7600.20861 |
131,584 |
18-Dec-2010 |
05:25 |
x86 |
|
Aaclient.mof |
Not applicable |
1,261 |
22-Jul-2009 |
22:58 |
Not applicable |
|
Mstscax.dll |
6.1.7600.20861 |
2,705,408 |
18-Dec-2010 |
05:29 |
x86 |
|
Mstscax.mof |
Not applicable |
2,054 |
22-Jul-2009 |
23:02 |
Not applicable |
|
Tsgqec.dll |
6.1.7600.20861 |
36,864 |
18-Dec-2010 |
05:30 |
x86 |
|
Aaclient.dll |
6.1.7601.17514 |
131,584 |
20-Nov-2010 |
12:18 |
x86 |
|
Aaclient.mof |
Not applicable |
1,261 |
10-Jun-2009 |
21:14 |
Not applicable |
|
Mstscax.dll |
6.1.7601.21624 |
3,215,872 |
18-Dec-2010 |
07:57 |
x86 |
|
Mstscax.mof |
Not applicable |
2,054 |
10-Jun-2009 |
21:17 |
Not applicable |
|
Tsgqec.dll |
6.1.7601.17514 |
36,864 |
20-Nov-2010 |
12:21 |
x86 |
Workaround
Workaround for Windows 7 and for Windows Server 2008 R2
To work around the issue, start the DWM service on the computer. Note This method causes drawback on the processing power on the computer and requires more bandwidth.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
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 updatesFor more information about Windows MultiPoint Server 2010, visit the following Microsoft webpage:
Introduction to Windows MultiPoint Server 2010This issue may occur when an application runs in a Remote Desktop Services session by executing the following call.
WTSVirtualChannelOpenEx( WTS_CURRENT_SESSION, "dwmprox", WTS_CHANNEL_OPTION_DYNAMIC);
Additional file information
Additional file information for Windows 7 and for Windows Server 2008 R2
Additional files for all supported x86-based versions of Windows 7
|
File name |
X86_38c1b79260f0810e24b5f0dbc9074645_31bf3856ad364e35_6.1.7600.20861_none_529f73a7f1cbc162.manifest |
|
File version |
Not applicable |
|
File size |
1,093 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
X86_fed5f1aec1f9e351fd4d9d556bcce782_31bf3856ad364e35_6.1.7601.21624_none_f5202520aa984226.manifest |
|
File version |
Not applicable |
|
File size |
1,093 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7600.20861_none_4e4de6cb9b7c1c97.manifest |
|
File version |
Not applicable |
|
File size |
20,880 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
05:59 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7601.21624_none_5062845f987f64c4.manifest |
|
File version |
Not applicable |
|
File size |
20,880 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
08:33 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7600.20861_none_305fa0f3400cc316.manifest |
|
File version |
Not applicable |
|
File size |
131,498 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:00 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7601.21624_none_32743e873d100b43.manifest |
|
File version |
Not applicable |
|
File size |
140,967 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:27 |
|
Platform |
Not applicable |
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
|
File name |
Amd64_4a02d8c886c9a5383f88affa3c268863_31bf3856ad364e35_6.1.7600.20861_none_e82ba6834b2a5de7.manifest |
|
File version |
Not applicable |
|
File size |
1,838 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
Amd64_8564218264cec6a742a4572f59fd71ef_31bf3856ad364e35_6.1.7601.21624_none_6b19cd11806929dc.manifest |
|
File version |
Not applicable |
|
File size |
1,838 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
Amd64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7600.20861_none_aa6c824f53d98dcd.manifest |
|
File version |
Not applicable |
|
File size |
20,886 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:54 |
|
Platform |
Not applicable |
|
File name |
Amd64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7601.21624_none_ac811fe350dcd5fa.manifest |
|
File version |
Not applicable |
|
File size |
20,886 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
09:27 |
|
Platform |
Not applicable |
|
File name |
Amd64_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7600.20861_none_8c7e3c76f86a344c.manifest |
|
File version |
Not applicable |
|
File size |
131,504 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:56 |
|
Platform |
Not applicable |
|
File name |
Amd64_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7601.21624_none_8e92da0af56d7c79.manifest |
|
File version |
Not applicable |
|
File size |
140,973 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:29 |
|
Platform |
Not applicable |
|
File name |
Wow64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7600.20861_none_b4c12ca1883a4fc8.manifest |
|
File version |
Not applicable |
|
File size |
13,023 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
05:51 |
|
Platform |
Not applicable |
|
File name |
Wow64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7601.21624_none_b6d5ca35853d97f5.manifest |
|
File version |
Not applicable |
|
File size |
13,023 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
08:24 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7600.20861_none_305fa0f3400cc316.manifest |
|
File version |
Not applicable |
|
File size |
131,498 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:00 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7601.21624_none_32743e873d100b43.manifest |
|
File version |
Not applicable |
|
File size |
140,967 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:29 |
|
Platform |
Not applicable |
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
|
File name |
Ia64_50c1bac89f43ad634570a46a1689368a_31bf3856ad364e35_6.1.7601.21624_none_dc82a71e6603f95e.manifest |
|
File version |
Not applicable |
|
File size |
1,835 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
Ia64_cf1e802747784a5b4c58b71cb7ee9e02_31bf3856ad364e35_6.1.7600.20861_none_5286baa16736741a.manifest |
|
File version |
Not applicable |
|
File size |
1,835 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
Ia64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7600.20861_none_4e4f8ac19b7a2593.manifest |
|
File version |
Not applicable |
|
File size |
20,883 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:53 |
|
Platform |
Not applicable |
|
File name |
Ia64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7601.21624_none_50642855987d6dc0.manifest |
|
File version |
Not applicable |
|
File size |
20,883 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
09:59 |
|
Platform |
Not applicable |
|
File name |
Ia64_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7600.20861_none_306144e9400acc12.manifest |
|
File version |
Not applicable |
|
File size |
131,501 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:53 |
|
Platform |
Not applicable |
|
File name |
Ia64_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7601.21624_none_3275e27d3d0e143f.manifest |
|
File version |
Not applicable |
|
File size |
140,970 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
|
File name |
Wow64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7600.20861_none_b4c12ca1883a4fc8.manifest |
|
File version |
Not applicable |
|
File size |
13,023 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
05:51 |
|
Platform |
Not applicable |
|
File name |
Wow64_microsoft-windows-t..minalservicesclient_31bf3856ad364e35_6.1.7601.21624_none_b6d5ca35853d97f5.manifest |
|
File version |
Not applicable |
|
File size |
13,023 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
08:24 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7600.20861_none_305fa0f3400cc316.manifest |
|
File version |
Not applicable |
|
File size |
131,498 |
|
Date (UTC) |
18-Dec-2010 |
|
Time (UTC) |
06:00 |
|
Platform |
Not applicable |
|
File name |
X86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.1.7601.21624_none_32743e873d100b43.manifest |
|
File version |
Not applicable |
|
File size |
140,967 |
|
Date (UTC) |
21-Dec-2010 |
|
Time (UTC) |
00:25 |
|
Platform |
Not applicable |
