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:

  • You have a computer that is running Windows Server 2008 R2 or Windows 7.

  • An application or service uses Winsock API or Winsock Kernel API to make network connections on the computer.

In this scenario, you experience one or more of the following symptoms:

  • The application or service randomly stops responding.

  • A number of connections appear in the "CLOSE WAIT" state in netstat output and remain in this state until the system is rebooted.

  • The application or service consumes an unusually high number of handles.

  • The System process consumes an unusually high number of handles in cases where System Center Configuration Manager 2007 client push is enabled. Disabling the Client Push feature of SCCM, stops or minimizes the increase in handle count if the System process.

Cause

This issue occurs because of a race condition in the TCP/IP driver (tcpip.sys).

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 Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

  • Windows 7

  • Windows 7 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, 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 Server 2008 R2 and Windows 7

    RTM

    LDR

    6.0.760
    1. 21xxx

    Windows Server 2008 R2 and Windows 7

    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

Fwpkclnt.sys

6.1.7600.20882

187,264

17-Jan-2011

05:42

x86

Tcpip.sys

6.1.7600.20882

1,298,304

17-Jan-2011

05:43

x86

Fwpkclnt.sys

6.1.7601.21642

187,776

15-Jan-2011

05:41

x86

Tcpip.sys

6.1.7601.21642

1,299,328

15-Jan-2011

05:41

x86

For all supported x64-based versions of Windows Server 2008 R2 and of Windows 7

File name

File version

File size

Date

Time

Platform

Fwpkclnt.sys

6.1.7600.20882

288,128

17-Jan-2011

06:23

x64

Tcpip.sys

6.1.7600.20882

1,893,248

17-Jan-2011

06:23

x64

Fwpkclnt.sys

6.1.7601.21642

288,640

15-Jan-2011

06:28

x64

Tcpip.sys

6.1.7601.21642

1,928,064

15-Jan-2011

06:27

x64

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

File name

File version

File size

Date

Time

Platform

Fwpkclnt.sys

6.1.7600.20882

482,688

17-Jan-2011

05:20

IA-64

Tcpip.sys

6.1.7600.20882

3,800,960

17-Jan-2011

05:20

IA-64

Fwpkclnt.sys

6.1.7601.21642

483,200

15-Jan-2011

05:19

IA-64

Tcpip.sys

6.1.7601.21642

3,802,496

15-Jan-2011

05:19

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 Winsock Kernel, visit the following Microsoft Developer Network (MSDN) website:

General information about Winsock KernelFor 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 Server 2008 R2 and for Windows 7

Additional files for all supported x86-based versions of Windows 7

File name

X86_0fdfdd10780d419a879ef4f39eca5d89_31bf3856ad364e35_6.1.7600.20882_none_6493058edd08a1c2.manifest

File version

Not applicable

File size

702

Date (UTC)

17-Jan-2011

Time (UTC)

21:13

Platform

Not applicable

File name

X86_5123ae99da51860ff683763bcdfc21c5_31bf3856ad364e35_6.1.7601.21642_none_32901e7002ff247d.manifest

File version

Not applicable

File size

702

Date (UTC)

17-Jan-2011

Time (UTC)

21:13

Platform

Not applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20882_none_b37b0bfae0da1ec8.manifest

File version

Not applicable

File size

3,834

Date (UTC)

17-Jan-2011

Time (UTC)

06:13

Platform

Not applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21642_none_b58ca8b0dde01af0.manifest

File version

Not applicable

File size

3,834

Date (UTC)

15-Jan-2011

Time (UTC)

06:08

Platform

Not applicable

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

File name

Amd64_7284bed783cc23a7730ae6010ac715e7_31bf3856ad364e35_6.1.7600.20882_none_af6b2b20876e52f4.manifest

File version

Not applicable

File size

706

Date (UTC)

17-Jan-2011

Time (UTC)

21:13

Platform

Not applicable

File name

Amd64_7afddb586db644908dc57c02639a90d1_31bf3856ad364e35_6.1.7601.21642_none_21da1e3203721710.manifest

File version

Not applicable

File size

706

Date (UTC)

17-Jan-2011

Time (UTC)

21:13

Platform

Not applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20882_none_0f99a77e99378ffe.manifest

File version

Not applicable

File size

3,838

Date (UTC)

17-Jan-2011

Time (UTC)

07:02

Platform

Not applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21642_none_11ab4434963d8c26.manifest

File version

Not applicable

File size

3,838

Date (UTC)

15-Jan-2011

Time (UTC)

07:05

Platform

Not applicable

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

File name

Ia64_4e7c5db0811366173e72456abacea3fe_31bf3856ad364e35_6.1.7600.20882_none_4b1e883fd12a3313.manifest

File version

Not applicable

File size

704

Date (UTC)

17-Jan-2011

Time (UTC)

21:13

Platform

Not applicable

File name

Ia64_9e78ed95e3463fbe9c2d610c8afc778e_31bf3856ad364e35_6.1.7601.21642_none_7b69a5f7c475c36e.manifest

File version

Not applicable

File size

704

Date (UTC)

17-Jan-2011

Time (UTC)

21:13

Platform

Not applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20882_none_b37caff0e0d827c4.manifest

File version

Not applicable

File size

3,836

Date (UTC)

17-Jan-2011

Time (UTC)

06:48

Platform

Not applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21642_none_b58e4ca6ddde23ec.manifest

File version

Not applicable

File size

3,836

Date (UTC)

15-Jan-2011

Time (UTC)

07:01

Platform

Not applicable

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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