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Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.

Symptoms

Assume that you connect a Web-based Distributed Authoring and Versioning (WebDAV) resource on a computer that is running Windows 7 or Windows Server 2008 R2. In this situation, a WebClient service crashes intermittently on the computer. Additionally, an event that resembles the following event may be logged in the Application log:

Note If you want to recover the WebClient service, you have to restart the computer.

Cause

This issue occurs because an access violation to the WebClient service occurs.

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 that is 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 exist, 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 with Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 with Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 or a 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 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 to which each hotfix applies.

  • 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

    6.1.760
    0.
    20xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.
    21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • 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 very important to maintaining 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

Webclnt.dll

6.1.7600.20967

204,800

14-May-2011

06:32

x86

Webclnt.dll

6.1.7601.21728

204,800

14-May-2011

07:43

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

Webclnt.dll

6.1.7600.20967

258,560

14-May-2011

07:41

x64

Webclnt.dll

6.1.7601.21728

258,560

14-May-2011

07:11

x64

Webclnt.dll

6.1.7600.20967

204,800

14-May-2011

06:32

x86

Webclnt.dll

6.1.7601.21728

204,800

14-May-2011

07:43

x86

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 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

File name

Update.mum

File version

Not applicable

File size

2,298

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

X86_276fec25aff5b2013977c1c2ca619593_31bf3856ad364e35_6.1.7601.21728_none_a1418d7b388ac929.manifest

File version

Not applicable

File size

709

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

X86_7a4b5c8a0dd63277ea9c4b418eab73cc_31bf3856ad364e35_6.1.7600.20967_none_f01361287a069798.manifest

File version

Not applicable

File size

709

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

X86_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.1.7600.20967_none_559d66952e10c54b.manifest

File version

Not applicable

File size

2,413

Date (UTC)

14-May-2011

Time (UTC)

07:02

Platform

Not applicable

File name

X86_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.1.7601.21728_none_57b003952b15daca.manifest

File version

Not applicable

File size

2,413

Date (UTC)

14-May-2011

Time (UTC)

08:14

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_276fec25aff5b2013977c1c2ca619593_31bf3856ad364e35_6.1.7601.21728_none_fd6028fef0e83a5f.manifest

File version

Not applicable

File size

711

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

Amd64_3d2c2edad3d633521adb20c01e680175_31bf3856ad364e35_6.1.7601.21728_none_3b4e744046858662.manifest

File version

Not applicable

File size

1,066

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

Amd64_3ea08b8db360f2673a4b88ff7e7af2c5_31bf3856ad364e35_6.1.7600.20967_none_387f434a472fcf7c.manifest

File version

Not applicable

File size

1,066

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

Amd64_7824ed0cab560b68bd22c25a6fb38af4_31bf3856ad364e35_6.1.7601.21728_none_2324fcf532739c6a.manifest

File version

Not applicable

File size

713

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

Amd64_7a4b5c8a0dd63277ea9c4b418eab73cc_31bf3856ad364e35_6.1.7600.20967_none_4c31fcac326408ce.manifest

File version

Not applicable

File size

711

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

Amd64_c6451b4602dab684e0ba727bc36c6017_31bf3856ad364e35_6.1.7600.20967_none_c2c959fe029f7882.manifest

File version

Not applicable

File size

713

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

Amd64_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.1.7600.20967_none_b1bc0218e66e3681.manifest

File version

Not applicable

File size

2,417

Date (UTC)

14-May-2011

Time (UTC)

08:11

Platform

Not applicable

File name

Amd64_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.1.7601.21728_none_b3ce9f18e3734c00.manifest

File version

Not applicable

File size

2,417

Date (UTC)

14-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,145

Date (UTC)

16-May-2011

Time (UTC)

15:42

Platform

Not applicable

File name

X86_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.1.7600.20967_none_559d66952e10c54b.manifest

File version

Not applicable

File size

2,413

Date (UTC)

14-May-2011

Time (UTC)

07:02

Platform

Not applicable

File name

X86_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.1.7601.21728_none_57b003952b15daca.manifest

File version

Not applicable

File size

2,413

Date (UTC)

14-May-2011

Time (UTC)

08:14

Platform

Not applicable

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