You cannot access shared files or shared printers in Windows 7 or in Windows Server 2008 R2

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

Symptoms

Consider the following scenario:

  • A computer is running Windows 7 or Windows Server 2008 R2.

  • The computer is running under a heavy load.

  • You try to access shared files or shared printers from the computer by using the Server Message Block (SMB) v1 protocol.

In this scenario, you cannot access shared files or shared printers. Additionally, you receive an error message that resembles the following:

Specified network name is no longer available.

Cause

This issue occurs because of a race condition in the Mrxsmb10.sys driver.

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 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.

    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 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

Mrxsmb10.sys

6.1.7600.20861

221,696

18-Dec-2010

03:20

x86

Mrxsmb10.sys

6.1.7601.21624

223,232

18-Dec-2010

05:50

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

Mrxsmb10.sys

6.1.7600.20861

286,720

18-Dec-2010

03:32

x64

Mrxsmb10.sys

6.1.7601.21624

287,744

18-Dec-2010

06:09

x64

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

File name

File version

File size

Date

Time

Platform

Mrxsmb10.sys

6.1.7600.20861

673,792

18-Dec-2010

02:56

IA-64

Mrxsmb10.sys

6.1.7601.21624

675,840

18-Dec-2010

06:44

IA-64

Workaround

Workaround for Windows 7 and for Windows Server 2008 R2

To work around this issue, you have to restart the computer.

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

2,773

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

X86_6f366e54fa3c832866d9d9a3a684ad90_31bf3856ad364e35_6.1.7601.21624_none_3f6d41f944d20775.manifest

File version

Not applicable

File size

701

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

X86_9c8d6c57513a169b6a141c91ff783b99_31bf3856ad364e35_6.1.7600.20861_none_191d98bc3c05c62b.manifest

File version

Not applicable

File size

701

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

X86_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7600.20861_none_891624bfc5d33a1e.manifest

File version

Not applicable

File size

3,962

Date (UTC)

18-Dec-2010

Time (UTC)

06:03

Platform

Not applicable

File name

X86_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7601.21624_none_8b2ac253c2d6824b.manifest

File version

Not applicable

File size

3,962

Date (UTC)

18-Dec-2010

Time (UTC)

08:37

Platform

Not applicable

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

File name

Amd64_002f980073be4a8973ddf9de9d34a051_31bf3856ad364e35_6.1.7601.21624_none_ad9233ade71aace0.manifest

File version

Not applicable

File size

705

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

Amd64_3fd29731152a6e6832a628c9bfbd81c8_31bf3856ad364e35_6.1.7600.20861_none_c8042b3e579d5f63.manifest

File version

Not applicable

File size

705

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

Amd64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7600.20861_none_e534c0437e30ab54.manifest

File version

Not applicable

File size

3,966

Date (UTC)

18-Dec-2010

Time (UTC)

07:01

Platform

Not applicable

File name

Amd64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7601.21624_none_e7495dd77b33f381.manifest

File version

Not applicable

File size

3,966

Date (UTC)

18-Dec-2010

Time (UTC)

09:30

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,215

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

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

File name

Ia64_54f7471b111d548732784c3967b38608_31bf3856ad364e35_6.1.7600.20861_none_5114685baba39418.manifest

File version

Not applicable

File size

703

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

Ia64_75f0c8d4459e7b8099b05c0e61a7d0f5_31bf3856ad364e35_6.1.7601.21624_none_a0fa1a58254875a7.manifest

File version

Not applicable

File size

703

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

File name

Ia64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7600.20861_none_8917c8b5c5d1431a.manifest

File version

Not applicable

File size

3,964

Date (UTC)

18-Dec-2010

Time (UTC)

06:55

Platform

Not applicable

File name

Ia64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7601.21624_none_8b2c6649c2d48b47.manifest

File version

Not applicable

File size

3,964

Date (UTC)

18-Dec-2010

Time (UTC)

10:02

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,168

Date (UTC)

20-Dec-2010

Time (UTC)

18:39

Platform

Not applicable

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