Improved interoperability between the BranchCache feature and the Offline Files feature in Windows 7 or in Windows Server 2008 R2

Article ID: 2675611 - View products that this article applies to.
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SUMMARY

This article introduces a hotfix that improves the interoperability between the BranchCache feature and the Offline Files feature in Windows 7 and in Windows Server 2008 R2.

Currently, the BranchCache feature uses the WTSQueryUserToken function to maintain the token cache for users who log on in a local branch office environment. To make sure that the Offline Files feature can impersonate the appropriate skin, the client-side caching driver (Csc.sys) sends an upcall to the Offline Files feature (Cscservice.exe). Then, the upcall triggers a prefetch request that incorporates the logon ID of the VNetRoot pointer. This behavior enables the Offline Files feature to open a handle on behalf of the original user.

However, the WTSQueryUserToken function cannot retrieve tokens that are not associated with Remote Desktop logon sessions (such as tokens that are created by using the runas.exe /netonly command or by using direct LogonUser() API calls). Therefore, when the BranchCache feature uses the WTSQueryUserToken function to retrieve tokens that are not associated with Romote Desktop logon sessions, the prefetch request fails. This behavior causes WAN connections to perform file IO operations.

For example, consider the following scenario:
  • The BranchCache feature is deployed in distributed cache mode in a local branch environment.
  • The Forefront Endpoint Protection (FEP) definition update service runs under the context of the Network Service credentials.
  • The FEP definition updates are distributed by using DFSR shares.
In this situation, the BranchCache feature does not function as expected. Therefore, if there is no local server in the branch office, the client computers download FEP definition updates from the hosted SMB shares (DFSR) through the WAN connection.
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RESOLUTION

If the BranchCache feature is deployed in distributed cache mode, install this hotfix only on the client computers that have the BranchCache feature enabled in the local branch environment. If the BranchCache feature is deployed in hosted cache mode, this hotfix is not required.

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 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)
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 the hotfix in this package, 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
  • The files that apply to a specific product, milestone (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 0.21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.21xxxWindows 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 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
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File nameFile versionFile sizeDateTimePlatform
Cscsvc.dll6.1.7600.21148547,32810-Feb-201205:35x86
Cscsvc.dll6.1.7601.21920547,84010-Feb-201205:27x86
Msv1_0.dll6.1.7600.21148258,56010-Feb-201205:37x86
Msv1_0.dll6.1.7601.21920258,04810-Feb-201205:29x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Cscsvc.dll6.1.7600.21148693,76010-Feb-201206:23x64
Cscsvc.dll6.1.7601.21920694,78410-Feb-201206:23x64
Msv1_0.dll6.1.7600.21148312,83210-Feb-201206:26x64
Msv1_0.dll6.1.7601.21920312,83210-Feb-201206:25x64
Msv1_0.dll6.1.7600.21148258,56010-Feb-201205:37x86
Msv1_0.dll6.1.7601.21920258,04810-Feb-201205:29x86
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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.
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MORE INFORMATION

For more information about the BranchCache feature, visit the following Microsoft website:
General information about the BranchCache feature
(http://technet.microsoft.com/en-us/network/dd425028)
For more information about how the BranchCache feature works, visit the following Microsoft website:
How the BranchCache feature works in Windows 7 and in Windows Server 2008 R2
(http://technet.microsoft.com/library/dd755969(v=WS.10).aspx)
For more information about the WTSQueryUserToken function, visit the following Microsoft website:
General information about the WTSQueryUserToken function
(http://msdn.microsoft.com/library/windows/desktop/aa383840(v=vs.85).aspx)
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_microsoft-windows-offlinefiles-service_31bf3856ad364e35_6.1.7600.21148_none_0a61a90cdbae7822.manifest
File versionNot Applicable
File size56,703
Date (UTC)10-Feb-2012
Time (UTC)06:08
PlatformNot Applicable
File nameX86_microsoft-windows-offlinefiles-service_31bf3856ad364e35_6.1.7601.21920_none_0c55cd5ed8cbab59.manifest
File versionNot Applicable
File size56,703
Date (UTC)10-Feb-2012
Time (UTC)06:02
PlatformNot Applicable
File nameX86_microsoft-windows-security-ntlm_31bf3856ad364e35_6.1.7600.21148_none_7d4103d5dcd8f6c0.manifest
File versionNot Applicable
File size24,502
Date (UTC)10-Feb-2012
Time (UTC)06:08
PlatformNot Applicable
File nameX86_microsoft-windows-security-ntlm_31bf3856ad364e35_6.1.7601.21920_none_7f352827d9f629f7.manifest
File versionNot Applicable
File size24,502
Date (UTC)10-Feb-2012
Time (UTC)06:00
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_microsoft-windows-offlinefiles-service_31bf3856ad364e35_6.1.7600.21148_none_66804490940be958.manifest
File versionNot Applicable
File size56,710
Date (UTC)10-Feb-2012
Time (UTC)07:01
PlatformNot Applicable
File nameAmd64_microsoft-windows-offlinefiles-service_31bf3856ad364e35_6.1.7601.21920_none_687468e291291c8f.manifest
File versionNot Applicable
File size56,710
Date (UTC)10-Feb-2012
Time (UTC)06:59
PlatformNot Applicable
File nameAmd64_microsoft-windows-security-ntlm_31bf3856ad364e35_6.1.7600.21148_none_d95f9f59953667f6.manifest
File versionNot Applicable
File size24,506
Date (UTC)10-Feb-2012
Time (UTC)06:59
PlatformNot Applicable
File nameAmd64_microsoft-windows-security-ntlm_31bf3856ad364e35_6.1.7601.21920_none_db53c3ab92539b2d.manifest
File versionNot Applicable
File size24,506
Date (UTC)10-Feb-2012
Time (UTC)06:57
PlatformNot Applicable
File nameWow64_microsoft-windows-security-ntlm_31bf3856ad364e35_6.1.7600.21148_none_e3b449abc99729f1.manifest
File versionNot Applicable
File size14,567
Date (UTC)10-Feb-2012
Time (UTC)05:58
PlatformNot Applicable
File nameWow64_microsoft-windows-security-ntlm_31bf3856ad364e35_6.1.7601.21920_none_e5a86dfdc6b45d28.manifest
File versionNot Applicable
File size14,567
Date (UTC)10-Feb-2012
Time (UTC)05:50
PlatformNot Applicable
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Properties

Article ID: 2675611 - Last Review: March 14, 2012 - Revision: 1.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter KB2675611
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