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Article ID: 2756999 - Last Review: November 16, 2012 - Revision: 2.0

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Symptoms

Consider the following scenario:
  • You have two Windows 7-based or Windows Server 2008 R2-based computers that run as a COM client and as a COM server.
  • You run the COM client by using the following RunAs command:

    runas/user:domain\username COMClient.exe
  • You call the CoCreateInstance function from the COM client to create a COM component on the remote COM server.  
In this scenario, a handle leak occurs on the COM client.

Cause

This issue occurs because a token handle is not released by the RPC system service (RPCSS) caching after the token handle is referenced.

Note Usually, the token handle is freed after the COM call is completed on the client computer.

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=support (http://support.microsoft.com/contactus/?ws=support)
Note 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 Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1.

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  (http://support.microsoft.com/kb/976932/ ) Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

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

Restart requirement

You must 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:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 1.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. 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
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File nameFile versionFile sizeDateTimePlatform
Rpcss.dll6.1.7601.22118376,83225-Sep-201221:57x86
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For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Rpcss.dll6.1.7601.22118512,51226-Sep-201200:32x64
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For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Rpcss.dll6.1.7601.221181,085,95225-Sep-201221:21IA-64
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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  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

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
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File nameX86_d1745db48a8d6830db3fbea76c7cbafa_31bf3856ad364e35_6.1.7601.22118_none_c2a6416b2771c6b4.manifest
File versionNot applicable
File size706
Date (UTC)26-Sep-2012
Time (UTC)08:11
PlatformNot applicable
File nameX86_microsoft-windows-com-base-qfe-rpcss_31bf3856ad364e35_6.1.7601.22118_none_6c5fc394b53c444b.manifest
File versionNot applicable
File size2,003
Date (UTC)25-Sep-2012
Time (UTC)23:17
PlatformNot applicable
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Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameAmd64_cbd764c86423ad274e1159ab60784641_31bf3856ad364e35_6.1.7601.22118_none_d055fbec73d45a4a.manifest
File versionNot applicable
File size710
Date (UTC)26-Sep-2012
Time (UTC)08:11
PlatformNot applicable
File nameAmd64_microsoft-windows-com-base-qfe-rpcss_31bf3856ad364e35_6.1.7601.22118_none_c87e5f186d99b581.manifest
File versionNot applicable
File size2,005
Date (UTC)26-Sep-2012
Time (UTC)01:12
PlatformNot applicable
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File nameIa64_ef03b944fc69b7cbeb08dba4d46f68f8_31bf3856ad364e35_6.1.7601.22118_none_7def57c3ab51401d.manifest
File versionNot applicable
File size708
Date (UTC)26-Sep-2012
Time (UTC)08:11
PlatformNot applicable
File nameIa64_microsoft-windows-com-base-qfe-rpcss_31bf3856ad364e35_6.1.7601.22118_none_6c61678ab53a4d47.manifest
File versionNot applicable
File size2,004
Date (UTC)25-Sep-2012
Time (UTC)23:31
PlatformNot applicable
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Applies to
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2756999
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