Symptoms

A computer or a third-party network device cannot establish an IPsec tunnel through a network address translation (NAT) device to a computer that is running Windows 7 or Windows Server 2008 R2.

Note This issue does not occur if the same computer or the same third-party network device establishes an IPsec tunnel through a NAT device to a computer that is running Windows Server 2003.

The netsh tracing for this issue indicates that the computer that is running Windows 7 or Windows Server 2008 R2 receives the encoded packets. However, the computer does not respond to the packets.

Cause

When packets are sent to a client computer that is behind a NAT device, the computer that is running Windows 7 or Windows Server 2008 R2 does not select the correct security association (SA). Therefore, the IPsec tunnel cannot be established.


Resolution

Note This fix just restores the windows 2003 behavior for supporting 1 client over NAT-T IPSEC tunnel. Creating more than 1 IPSEC tunnel over NAT-T may lead to undesired behavior and is not a supported scenario.

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 this specific problem.

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, submit a request to 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 Web site:

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)

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 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

Fwpkclnt.sys

6.1.7600.20963

187,264

10-May-2011

04:34

x86

Tcpip.sys

6.1.7600.20963

1,299,328

10-May-2011

04:34

x86

Fwpkclnt.sys

6.1.7601.21724

187,776

10-May-2011

06:06

x86

Tcpip.sys

6.1.7601.21724

1,301,376

10-May-2011

06:06

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

Fwpkclnt.sys

6.1.7600.20963

288,128

10-May-2011

05:20

x64

Tcpip.sys

6.1.7600.20963

1,891,712

10-May-2011

05:20

x64

Fwpkclnt.sys

6.1.7601.21724

288,640

10-May-2011

05:21

x64

Tcpip.sys

6.1.7601.21724

1,926,528

10-May-2011

05:21

x64

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

File name

File version

File size

Date

Time

Platform

Fwpkclnt.sys

6.1.7600.20963

482,688

10-May-2011

04:15

IA-64

Tcpip.sys

6.1.7600.20963

3,804,032

10-May-2011

04:15

IA-64

Fwpkclnt.sys

6.1.7601.21724

483,200

10-May-2011

04:16

IA-64

Tcpip.sys

6.1.7601.21724

3,807,104

10-May-2011

04:16

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 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)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

X86_7e796fd25a7ecf637eaa709e8eb866ee_31bf3856ad364e35_6.1.7601.21724_none_c0d5d9c141c42cf0.manifest

File version

Not applicable

File size

702

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

X86_b2ab69fa09b959b24d9c995536d47e37_31bf3856ad364e35_6.1.7600.20963_none_3c25e9c3033ce1cf.manifest

File version

Not applicable

File size

702

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20963_none_b391ae02e0c8fd64.manifest

File version

Not applicable

File size

3,834

Date (UTC)

10-May-2011

Time (UTC)

04:59

Platform

Not applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21724_none_b5a44b02ddce12e3.manifest

File version

Not applicable

File size

3,834

Date (UTC)

10-May-2011

Time (UTC)

15:54

Platform

Not applicable

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

File name

Amd64_936e1b4e6e2a4b4310e9bdeb4b6d6042_31bf3856ad364e35_6.1.7601.21724_none_c5ef15a0aa895106.manifest

File version

Not applicable

File size

706

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

Amd64_f9a37b476533c450323ce8781d552e9a_31bf3856ad364e35_6.1.7600.20963_none_fb5ae70b988e3fd2.manifest

File version

Not applicable

File size

706

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20963_none_0fb0498699266e9a.manifest

File version

Not applicable

File size

3,838

Date (UTC)

10-May-2011

Time (UTC)

06:05

Platform

Not applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21724_none_11c2e686962b8419.manifest

File version

Not applicable

File size

3,838

Date (UTC)

10-May-2011

Time (UTC)

07:19

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,215

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

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

File name

Ia64_6276bbc7c927eb32fcb3993d6f2ec092_31bf3856ad364e35_6.1.7601.21724_none_40ca95f48c58907c.manifest

File version

Not applicable

File size

704

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

Ia64_d684811888a0e24ae6f7405ad0b261df_31bf3856ad364e35_6.1.7600.20963_none_3595beb4df553b91.manifest

File version

Not applicable

File size

704

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20963_none_b39351f8e0c70660.manifest

File version

Not applicable

File size

3,836

Date (UTC)

10-May-2011

Time (UTC)

06:00

Platform

Not applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21724_none_b5a5eef8ddcc1bdf.manifest

File version

Not applicable

File size

3,836

Date (UTC)

10-May-2011

Time (UTC)

07:09

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,168

Date (UTC)

10-May-2011

Time (UTC)

17:40

Platform

Not applicable

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