Symptoms

Assume that you perform a file operation from a Windows 7-based or Windows Server 2008 R2-based computer to a remote server. However, if you cancel the file operation, the server message block (SMB) connection to the remote server may be reset.

Note This issue occurs when the redirector (mrxsmb20.sys) receives a response to a canceled request.

Cause

This issue occurs because of a race condition in the redirector when the file operation is canceled before the network sending process is complete.

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 Web site:

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)

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 use 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:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.21xxx

    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 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

Mrxsmb.sys

6.1.7600.21030

123,904

17-Aug-2011

02:19

x86

Mrxsmb.sys

6.1.7601.21792

123,904

17-Aug-2011

03:14

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

Mrxsmb.sys

6.1.7600.21030

158,208

17-Aug-2011

03:06

x64

Mrxsmb.sys

6.1.7601.21792

158,208

17-Aug-2011

03:23

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Mrxsmb.sys

6.1.7600.21030

368,640

17-Aug-2011

02:06

IA-64

Mrxsmb.sys

6.1.7601.21792

367,616

17-Aug-2011

02:00

IA-64

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

X86_2cbcee69f4b6cec65d86f1c8ed21933f_31bf3856ad364e35_6.1.7600.21030_none_ec34a97f74b82929.manifest

File version

Not Applicable

File size

698

Date (UTC)

17-Aug-2011

Time (UTC)

18:42

File name

X86_f452b7e34bdb69a44044b40dce30706d_31bf3856ad364e35_6.1.7601.21792_none_57b210b788b86235.manifest

File version

Not Applicable

File size

698

Date (UTC)

17-Aug-2011

Time (UTC)

18:42

File name

X86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7600.21030_none_80224fedcb6abefb.manifest

File version

Not Applicable

File size

4,757

Date (UTC)

17-Aug-2011

Time (UTC)

04:53

File name

X86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.21792_none_81c9f5ddc8bfd1f9.manifest

File version

Not Applicable

File size

4,757

Date (UTC)

17-Aug-2011

Time (UTC)

06:34

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

File name

Amd64_5a8609055a940481d9ed0a4be6c33871_31bf3856ad364e35_6.1.7601.21792_none_ec2e2846803f340a.manifest

File version

Not Applicable

File size

702

Date (UTC)

17-Aug-2011

Time (UTC)

18:42

File name

Amd64_5f49cd486ee589115fb9faed66daecd7_31bf3856ad364e35_6.1.7600.21030_none_79a27757e444ee68.manifest

File version

Not Applicable

File size

702

Date (UTC)

17-Aug-2011

Time (UTC)

18:42

File name

Amd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7600.21030_none_dc40eb7183c83031.manifest

File version

Not Applicable

File size

4,761

Date (UTC)

17-Aug-2011

Time (UTC)

06:27

File name

Amd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.21792_none_dde89161811d432f.manifest

File version

Not Applicable

File size

4,761

Date (UTC)

17-Aug-2011

Time (UTC)

07:23

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_376764f6c50b05874d04d8a807fd2fa3_31bf3856ad364e35_6.1.7600.21030_none_053850f34ccb58a0.manifest

File version

Not Applicable

File size

700

Date (UTC)

17-Aug-2011

Time (UTC)

18:42

File name

Ia64_7b67b097f98487af92916b06eb08456a_31bf3856ad364e35_6.1.7601.21792_none_44c2657bf2cb79fa.manifest

File version

Not Applicable

File size

700

Date (UTC)

17-Aug-2011

Time (UTC)

18:42

File name

Ia64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7600.21030_none_8023f3e3cb68c7f7.manifest

File version

Not Applicable

File size

4,759

Date (UTC)

17-Aug-2011

Time (UTC)

05:46

File name

Ia64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.21792_none_81cb99d3c8bddaf5.manifest

File version

Not Applicable

File size

4,759

Date (UTC)

17-Aug-2011

Time (UTC)

07:07

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