You cannot establish an IPsec tunnel to a computer that is running Windows 7 or Windows Server 2008 R2 through a NAT device

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Article ID: 2523881 - View products that this article applies to.
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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=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 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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService 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 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Fwpkclnt.sys6.1.7600.20963187,26410-May-201104:34x86
Tcpip.sys6.1.7600.209631,299,32810-May-201104:34x86
Fwpkclnt.sys6.1.7601.21724187,77610-May-201106:06x86
Tcpip.sys6.1.7601.217241,301,37610-May-201106:06x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Fwpkclnt.sys6.1.7600.20963288,12810-May-201105:20x64
Tcpip.sys6.1.7600.209631,891,71210-May-201105:20x64
Fwpkclnt.sys6.1.7601.21724288,64010-May-201105:21x64
Tcpip.sys6.1.7601.217241,926,52810-May-201105:21x64
For all supported IA-64based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Fwpkclnt.sys6.1.7600.20963482,68810-May-201104:15IA-64
Tcpip.sys6.1.7600.209633,804,03210-May-201104:15IA-64
Fwpkclnt.sys6.1.7601.21724483,20010-May-201104:16IA-64
Tcpip.sys6.1.7601.217243,807,10410-May-201104:16IA-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
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot applicable
File size2,773
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameX86_7e796fd25a7ecf637eaa709e8eb866ee_31bf3856ad364e35_6.1.7601.21724_none_c0d5d9c141c42cf0.manifest
File versionNot applicable
File size702
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameX86_b2ab69fa09b959b24d9c995536d47e37_31bf3856ad364e35_6.1.7600.20963_none_3c25e9c3033ce1cf.manifest
File versionNot applicable
File size702
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20963_none_b391ae02e0c8fd64.manifest
File versionNot applicable
File size3,834
Date (UTC)10-May-2011
Time (UTC)04:59
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21724_none_b5a44b02ddce12e3.manifest
File versionNot applicable
File size3,834
Date (UTC)10-May-2011
Time (UTC)15:54
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_936e1b4e6e2a4b4310e9bdeb4b6d6042_31bf3856ad364e35_6.1.7601.21724_none_c5ef15a0aa895106.manifest
File versionNot applicable
File size706
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameAmd64_f9a37b476533c450323ce8781d552e9a_31bf3856ad364e35_6.1.7600.20963_none_fb5ae70b988e3fd2.manifest
File versionNot applicable
File size706
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20963_none_0fb0498699266e9a.manifest
File versionNot applicable
File size3,838
Date (UTC)10-May-2011
Time (UTC)06:05
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21724_none_11c2e686962b8419.manifest
File versionNot applicable
File size3,838
Date (UTC)10-May-2011
Time (UTC)07:19
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size3,215
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
Additional files for all supported IA-64based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_6276bbc7c927eb32fcb3993d6f2ec092_31bf3856ad364e35_6.1.7601.21724_none_40ca95f48c58907c.manifest
File versionNot applicable
File size704
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameIa64_d684811888a0e24ae6f7405ad0b261df_31bf3856ad364e35_6.1.7600.20963_none_3595beb4df553b91.manifest
File versionNot applicable
File size704
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20963_none_b39351f8e0c70660.manifest
File versionNot applicable
File size3,836
Date (UTC)10-May-2011
Time (UTC)06:00
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.21724_none_b5a5eef8ddcc1bdf.manifest
File versionNot applicable
File size3,836
Date (UTC)10-May-2011
Time (UTC)07:09
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,168
Date (UTC)10-May-2011
Time (UTC)17:40
PlatformNot applicable

Properties

Article ID: 2523881 - Last Review: December 27, 2012 - Revision: 4.0
Applies to
  • Windows 7 Starter
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Enterprise
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter KB2523881

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