Symptoms

Consider the following scenario:

  • You share files on a computer that is running Windows Server 2008 R2, Windows Server 2008, Windows 7 or Windows Vista acting as the file server.

  • You run an application to monitor changes of the shared files and folders on the computer from a SMB client computer by using the Server Message Block version 2 (SMBv2) protocol.

  • The application calls the FindFirstChangeNotification function and then immediately calls the FindCloseChangeNotification function to cancel the previous change notification.

In this scenario, the TCP session of the SMBv2 session is reset incorrectly after 4 minutes. Therefore, you may experience data loss or file corruption if you transfer data or files during the SMBv2 session.

Cause

The issue occurs because of a race condition in the SMBv2 session. The race condition occurs when an SMBv2 client sends a cancellation command immediately after a file change command is sent.

When the race condition occurs, the two commands are executed out of order. Therefore, the SMBv2 session is reset incorrectly.

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 Vista Service Pack 2 (SP2)

  • Windows Server 2008 Service Pack 2 (SP2)

  • 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 Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

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

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 Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" 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

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    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 and for Windows Vista" section. MUM files 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 Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Srvnet.sys

6.0.6002.22625

102,912

13-Apr-2011

13:38

x86

Srv2.sys

6.0.6002.22625

147,968

13-Apr-2011

13:38

x86

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Srvnet.sys

6.0.6002.22625

146,432

13-Apr-2011

13:57

x64

Srv2.sys

6.0.6002.22625

176,640

13-Apr-2011

13:57

x64

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

File name

File version

File size

Date

Time

Platform

Srvnet.sys

6.0.6002.22625

294,912

13-Apr-2011

14:06

IA-64

Srv2.sys

6.0.6002.22625

472,064

13-Apr-2011

14:06

IA-64

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, 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
    0.20xxx

    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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are very important for 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

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.1.7600.20881

310,784

15-Jan-2011

03:21

x86

Srv2.sys

6.1.7601.21642

310,784

15-Jan-2011

03:23

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

Srv2.sys

6.1.7600.20881

401,408

15-Jan-2011

03:42

x64

Srv2.sys

6.1.7601.21642

412,160

15-Jan-2011

03:37

x64

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

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.1.7600.20881

788,480

15-Jan-2011

02:54

IA-64

Srv2.sys

6.1.7601.21642

789,504

15-Jan-2011

02:53

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 the FindFirstChangeNotification function, visit the following Microsoft Development Network (MSDN) website:

General information about the FindFirstChangeNotification functionFor more information about the FindCloseChangeNotification function, visit the following MSDN website:

General information about the FindCloseChangeNotification functionFor more information about the SMB2 CANCEL request, visit the following MSDN websites:

General information about the SMB2 CANCEL request

Receiving an SMB2 CANCEL RequestFor more information about the SMB2 CHANGE_NOTIFY request, visit the following MSDN websites:

General information the SMB2 CHANGE_NOTIFY request

Receiving an SMB2 CHANGE_NOTIFY RequestFor 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 Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

File name

Update.mum

File version

Not Applicable

File size

3,078

Date (UTC)

13-Apr-2011

Time (UTC)

18:13

Platform

Not Applicable

File name

X86_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22625_none_0635adb12676ab72.manifest

File version

Not Applicable

File size

4,227

Date (UTC)

13-Apr-2011

Time (UTC)

16:10

Platform

Not Applicable

File name

X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22625_none_dc4c18ec0ccb4881.manifest

File version

Not Applicable

File size

4,426

Date (UTC)

13-Apr-2011

Time (UTC)

16:04

Platform

Not Applicable

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

File name

Amd64_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22625_none_62544934ded41ca8.manifest

File version

Not Applicable

File size

4,493

Date (UTC)

13-Apr-2011

Time (UTC)

16:27

Platform

Not Applicable

File name

Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22625_none_386ab46fc528b9b7.manifest

File version

Not Applicable

File size

4,688

Date (UTC)

13-Apr-2011

Time (UTC)

16:21

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

3,102

Date (UTC)

13-Apr-2011

Time (UTC)

18:13

Platform

Not Applicable

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

File name

Ia64_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22625_none_063751a72674b46e.manifest

File version

Not Applicable

File size

4,488

Date (UTC)

13-Apr-2011

Time (UTC)

16:19

Platform

Not Applicable

File name

Ia64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22625_none_dc4dbce20cc9517d.manifest

File version

Not Applicable

File size

4,683

Date (UTC)

13-Apr-2011

Time (UTC)

16:15

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,255

Date (UTC)

13-Apr-2011

Time (UTC)

18:12

Platform

Not Applicable

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

2,342

Date (UTC)

15-Jan-2011

Time (UTC)

15:59

Platform

Not applicable

File name

X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.20881_none_da4892cd70f07841.manifest

File version

Not applicable

File size

2,655

Date (UTC)

15-Jan-2011

Time (UTC)

06:04

Platform

Not applicable

File name

X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21642_none_dc5b2fcd6df58dc0.manifest

File version

Not applicable

File size

2,655

Date (UTC)

15-Jan-2011

Time (UTC)

06:02

Platform

Not applicable

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

File name

Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.20881_none_36672e51294de977.manifest

File version

Not applicable

File size

2,657

Date (UTC)

15-Jan-2011

Time (UTC)

06:57

Platform

Not applicable

File name

Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21642_none_3879cb512652fef6.manifest

File version

Not applicable

File size

2,657

Date (UTC)

15-Jan-2011

Time (UTC)

06:59

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,780

Date (UTC)

15-Jan-2011

Time (UTC)

15:59

Platform

Not applicable

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

File name

Ia64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.20881_none_da4a36c370ee813d.manifest

File version

Not applicable

File size

2,656

Date (UTC)

15-Jan-2011

Time (UTC)

06:48

Platform

Not applicable

File name

Ia64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21642_none_dc5cd3c36df396bc.manifest

File version

Not applicable

File size

2,656

Date (UTC)

15-Jan-2011

Time (UTC)

06:56

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,168

Date (UTC)

15-Jan-2011

Time (UTC)

15:59

Platform

Not applicable

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