An SMBv2 session is reset incorrectly if FindCloseChangeNotification function is called immediately after the FindFirstChangeNotification function is called in Windows Server 2008 R2 , in Windows Server 2008, in Windows Vista or in Windows 7

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Article ID: 2493869 - View products that this article applies to.
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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=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 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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.0.600 2 . 22xxxWindows Vista and Windows Server 2008SP2LDR
  • 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srvnet.sys6.0.6002.22625102,91213-Apr-201113:38x86
Srv2.sys6.0.6002.22625147,96813-Apr-201113:38x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srvnet.sys6.0.6002.22625146,43213-Apr-201113:57x64
Srv2.sys6.0.6002.22625176,64013-Apr-201113:57x64
For all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srvnet.sys6.0.6002.22625294,91213-Apr-201114:06IA-64
Srv2.sys6.0.6002.22625472,06413-Apr-201114:06IA-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:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 0.20xxxWindows 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 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srv2.sys6.1.7600.20881310,78415-Jan-201103:21x86
Srv2.sys6.1.7601.21642310,78415-Jan-201103:23x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srv2.sys6.1.7600.20881401,40815-Jan-201103:42x64
Srv2.sys6.1.7601.21642412,16015-Jan-201103:37x64
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srv2.sys6.1.7600.20881788,48015-Jan-201102:54IA-64
Srv2.sys6.1.7601.21642789,50415-Jan-201102:53IA-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 function
For more information about the FindCloseChangeNotification function, visit the following MSDN website:
General information about the FindCloseChangeNotification function
For more information about the SMB2 CANCEL request, visit the following MSDN websites:
General information about the SMB2 CANCEL request
Receiving an SMB2 CANCEL Request
For 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 Request
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 Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot Applicable
File size3,078
Date (UTC)13-Apr-2011
Time (UTC)18:13
PlatformNot Applicable
File nameX86_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22625_none_0635adb12676ab72.manifest
File versionNot Applicable
File size4,227
Date (UTC)13-Apr-2011
Time (UTC)16:10
PlatformNot Applicable
File nameX86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22625_none_dc4c18ec0ccb4881.manifest
File versionNot Applicable
File size4,426
Date (UTC)13-Apr-2011
Time (UTC)16:04
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
Collapse this tableExpand this table
File nameAmd64_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22625_none_62544934ded41ca8.manifest
File versionNot Applicable
File size4,493
Date (UTC)13-Apr-2011
Time (UTC)16:27
PlatformNot Applicable
File nameAmd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22625_none_386ab46fc528b9b7.manifest
File versionNot Applicable
File size4,688
Date (UTC)13-Apr-2011
Time (UTC)16:21
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size3,102
Date (UTC)13-Apr-2011
Time (UTC)18:13
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameIa64_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22625_none_063751a72674b46e.manifest
File versionNot Applicable
File size4,488
Date (UTC)13-Apr-2011
Time (UTC)16:19
PlatformNot Applicable
File nameIa64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22625_none_dc4dbce20cc9517d.manifest
File versionNot Applicable
File size4,683
Date (UTC)13-Apr-2011
Time (UTC)16:15
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size2,255
Date (UTC)13-Apr-2011
Time (UTC)18:12
PlatformNot Applicable

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot applicable
File size2,342
Date (UTC)15-Jan-2011
Time (UTC)15:59
PlatformNot applicable
File nameX86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.20881_none_da4892cd70f07841.manifest
File versionNot applicable
File size2,655
Date (UTC)15-Jan-2011
Time (UTC)06:04
PlatformNot applicable
File nameX86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21642_none_dc5b2fcd6df58dc0.manifest
File versionNot applicable
File size2,655
Date (UTC)15-Jan-2011
Time (UTC)06:02
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-smbserver-v2_31bf3856ad364e35_6.1.7600.20881_none_36672e51294de977.manifest
File versionNot applicable
File size2,657
Date (UTC)15-Jan-2011
Time (UTC)06:57
PlatformNot applicable
File nameAmd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21642_none_3879cb512652fef6.manifest
File versionNot applicable
File size2,657
Date (UTC)15-Jan-2011
Time (UTC)06:59
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,780
Date (UTC)15-Jan-2011
Time (UTC)15:59
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.20881_none_da4a36c370ee813d.manifest
File versionNot applicable
File size2,656
Date (UTC)15-Jan-2011
Time (UTC)06:48
PlatformNot applicable
File nameIa64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21642_none_dc5cd3c36df396bc.manifest
File versionNot applicable
File size2,656
Date (UTC)15-Jan-2011
Time (UTC)06:56
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,168
Date (UTC)15-Jan-2011
Time (UTC)15:59
PlatformNot applicable

Properties

Article ID: 2493869 - Last Review: June 16, 2011 - Revision: 4.0
APPLIES TO
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Vista Business
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate
  • Windows Vista Ultimate 64-bit Edition
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Standard
  • Windows Server 2008 Standard without Hyper-V
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2493869

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