You cannot connect to remote computers by using the SMB protocol on a computer that is running Windows 7 or Windows Server 2008 R2

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Article ID: 2739674 - View products that this article applies to.
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Symptoms

Assume that you send a high volume of requests from a Windows 7-based or Windows Server 2008 R2-based computer to remote computers by using the Server Message Block (SMB) protocol. In this situation, the computer cannot connect to the remote computers by using the SMB protocol.

Cause

This issue occurs because of a dead lock situation in the SMB session. For more information about this issue, please see the "More Information" section.

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 Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 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 apply this hotfix, 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:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • 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 extremely important to 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
Mrxsmb20.sys6.1.7601.1797096,76809-Oct-201215:34x86
Mrxsmb20.sys6.1.7601.2213096,76809-Oct-201215:25x86
Mrxsmb.sys6.1.7601.17970123,90409-Oct-201215:33x86
Mrxsmb.sys6.1.7601.22130123,90409-Oct-201215:25x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.1.7601.17970128,00009-Oct-201215:31x64
Mrxsmb20.sys6.1.7601.22130128,00009-Oct-201215:45x64
Mrxsmb.sys6.1.7601.17970158,20809-Oct-201215:32x64
Mrxsmb.sys6.1.7601.22130158,20809-Oct-201215:46x64
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.1.7601.17970310,27209-Oct-201214:42IA-64
Mrxsmb20.sys6.1.7601.22130310,78409-Oct-201215:08IA-64
Mrxsmb.sys6.1.7601.17970368,12809-Oct-201214:42IA-64
Mrxsmb.sys6.1.7601.22130368,12809-Oct-201215:08IA-64

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

Assume that an SMB session has a single tree connection between a Common Internet File System (CIFS) client computer and a share on a remote CIFS server. If the connection fails, a scavenger tries to free it up. During the scavenging process, the scavenger also tries to free up the session if the connection is the only tree connected during the session. A logoff request will not be sent before the session is freed. However, if the connection request and the logoff request are in a synchronous exchange, the session setup process waits for it to be completed. Therefore, a dead lock situation occurs. 

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
Collapse this tableExpand this table
File nameX86_b65dde4abe28325cc351390ced65cb8e_31bf3856ad364e35_6.1.7601.22130_none_8393121de13bed4e.manifest
File versionNot applicable
File size698
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameX86_de3dd7c5c2d4cf3c34cc88f41212b476_31bf3856ad364e35_6.1.7601.17970_none_28c7f509b998c49f.manifest
File versionNot applicable
File size698
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameX86_ed172e614843c92a9d8d04a8c5059edd_31bf3856ad364e35_6.1.7601.22130_none_be12e859b1f6ab00.manifest
File versionNot applicable
File size701
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameX86_f434dcd4baddc479dc233ad4dcb1a1fa_31bf3856ad364e35_6.1.7601.17970_none_d70d44e2d450dea3.manifest
File versionNot applicable
File size701
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.17970_none_8c9d866ee83c30e7.manifest
File versionNot applicable
File size4,035
Date (UTC)09-Oct-2012
Time (UTC)18:36
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.22130_none_8d523b0c0139942f.manifest
File versionNot applicable
File size4,035
Date (UTC)09-Oct-2012
Time (UTC)18:08
PlatformNot applicable
File nameX86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.17970_none_8153fe08af93bf14.manifest
File versionNot applicable
File size4,757
Date (UTC)09-Oct-2012
Time (UTC)18:24
PlatformNot applicable
File nameX86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.22130_none_8208b2a5c891225c.manifest
File versionNot applicable
File size4,757
Date (UTC)09-Oct-2012
Time (UTC)18:00
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_1e2120b358fea2ba57821b8e68151196_31bf3856ad364e35_6.1.7601.22130_none_0a1a009a9167aedd.manifest
File versionNot applicable
File size702
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameAmd64_21fbc06755fc6e5b61021e030d03da38_31bf3856ad364e35_6.1.7601.17970_none_5f2acdf553769991.manifest
File versionNot applicable
File size705
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameAmd64_db22c632ec30333f8f075d487734bd49_31bf3856ad364e35_6.1.7601.17970_none_32312009d888b4fa.manifest
File versionNot applicable
File size702
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameAmd64_fae4380b4f6d955f95103fb9fc13784c_31bf3856ad364e35_6.1.7601.22130_none_254c3e06b5c384bc.manifest
File versionNot applicable
File size705
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.17970_none_e8bc21f2a099a21d.manifest
File versionNot applicable
File size4,039
Date (UTC)09-Oct-2012
Time (UTC)19:10
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.22130_none_e970d68fb9970565.manifest
File versionNot applicable
File size4,039
Date (UTC)09-Oct-2012
Time (UTC)19:15
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.17970_none_dd72998c67f1304a.manifest
File versionNot applicable
File size4,761
Date (UTC)09-Oct-2012
Time (UTC)18:59
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.22130_none_de274e2980ee9392.manifest
File versionNot applicable
File size4,761
Date (UTC)09-Oct-2012
Time (UTC)19:05
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_32fa14263e853fa46e18d214fe36f42a_31bf3856ad364e35_6.1.7601.17970_none_d5da542c6b373012.manifest
File versionNot applicable
File size700
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameIa64_95fe05708e523ebb575ff6ddc67f6340_31bf3856ad364e35_6.1.7601.17970_none_3aa503fb4aafce87.manifest
File versionNot applicable
File size703
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameIa64_99f0fa43824c6b03c09867cfa1e2d803_31bf3856ad364e35_6.1.7601.22130_none_7dcc869852c36028.manifest
File versionNot applicable
File size703
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameIa64_ed1bae50f57d5ae488fa0151b23ec4bd_31bf3856ad364e35_6.1.7601.22130_none_bbb92597a2b70911.manifest
File versionNot applicable
File size700
Date (UTC)09-Oct-2012
Time (UTC)21:07
PlatformNot applicable
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.17970_none_8c9f2a64e83a39e3.manifest
File versionNot applicable
File size4,037
Date (UTC)09-Oct-2012
Time (UTC)19:03
PlatformNot applicable
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.22130_none_8d53df0201379d2b.manifest
File versionNot applicable
File size4,037
Date (UTC)09-Oct-2012
Time (UTC)18:59
PlatformNot applicable
File nameIa64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.17970_none_8155a1feaf91c810.manifest
File versionNot applicable
File size4,759
Date (UTC)09-Oct-2012
Time (UTC)18:57
PlatformNot applicable
File nameIa64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.22130_none_820a569bc88f2b58.manifest
File versionNot applicable
File size4,759
Date (UTC)09-Oct-2012
Time (UTC)18:52
PlatformNot applicable

Properties

Article ID: 2739674 - Last Review: November 14, 2012 - Revision: 1.0
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 Web Server 2008 R2
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2739674

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