Concurrent connections that use AuthIP might not work in Windows Server 2008 R2 or in Windows 7

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Article ID: 2580149 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You apply an Internet Protocol security (IPsec) policy on a computer that is running Windows Server 2008 R2 or Windows 7. The policy uses AuthIP for IPsec key negotiation.
  • Multiple users use Authenticated Internet Protocol (AuthIP) to establish remote IPsec connections to the computer at the same time.
In this scenario, some IPsec negotiation packets are incorrectly dropped. Therefore, some clients cannot establish a connection to the computer.

CAUSE

This issue occurs because the IPsec module throttles IPsec connections incorrectly.

When the number of active security associations (SAs) between two computers is greater than a threshold number, the IPsec module drops some SAs. However, the module does not differentiate user accounts. Therefore, a threshold number per user is not implemented as expected.

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 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 Windows 7 or 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, 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 0.16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0.21xxxWindows 7 and Windows Server 2008 R2RTMLDR
  • 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 critical 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
Bfe.dll6.1.7600.21009495,61615-Jul-201107:18x86
Fwpuclnt.dll6.1.7600.16385216,57614-Jul-200901:15x86
Ikeext.dll6.1.7600.21009670,20815-Jul-201107:19x86
Networksecurity-ppdlic.xrm-msNot applicable3,02815-Jul-201107:37Not applicable
Nshwfp.dll6.1.7600.21009657,92015-Jul-201107:21x86
Wfp.mofNot applicable82210-Jun-200921:32Not applicable
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Bfe.dll6.1.7600.21009705,02415-Jul-201107:19x64
Fwpuclnt.dll6.1.7600.16385324,09614-Jul-200901:40x64
Ikeext.dll6.1.7600.21009848,38415-Jul-201107:21x64
Networksecurity-ppdlic.xrm-msNot applicable3,02815-Jul-201107:44Not applicable
Nshwfp.dll6.1.7600.21009832,00015-Jul-201107:23x64
Wfp.mofNot applicable82210-Jun-200920:51Not applicable
Fwpuclnt.dll6.1.7600.21009216,57615-Jul-201107:19x86
Nshwfp.dll6.1.7600.21009657,92015-Jul-201107:21x86
Wfp.mofNot applicable82222-Jul-200923:17Not applicable
For all supported IA-64based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Bfe.dll6.1.7600.210091,074,17615-Jul-201107:11IA-64
Fwpuclnt.dll6.1.7600.21009566,27215-Jul-201107:12IA-64
Ikeext.dll6.1.7600.210091,475,07215-Jul-201107:13IA-64
Networksecurity-ppdlic.xrm-msNot applicable3,02815-Jul-201107:30Not applicable
Nshwfp.dll6.1.7600.210091,114,11215-Jul-201107:14IA-64
Wfp.mofNot applicable82210-Jun-200920:57Not applicable
Fwpuclnt.dll6.1.7600.21009216,57615-Jul-201107:19x86
Nshwfp.dll6.1.7600.21009657,92015-Jul-201107:21x86
Wfp.mofNot applicable82222-Jul-200923:17Not applicable

WORKAROUND

To work around this issue, set the 0x40 bit of the following registry entry in order to disable AuthIP on the affected computer:
Location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IKEEXT\Parameters
Name: IKEFlags
Type: REG_DWORD
Value:

mportant This registry entry is interpreted as a bit-mask. The bit that disables AuthIP is positioned at the 0x40 bit. We recommend that you do not modify the other bits. To prevent any other issues, do not change the other bits. For example, IKEFlags has the 0x1400 DWORD value. To disable AuthIP, change the value to the 0x1440 DWORD value.

Note Active Directory Group Policy settings can override changes on the local computer.

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 size1,880
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameX86_b6325a9107d55a84ca1768eb1795b24e_31bf3856ad364e35_6.1.7600.21009_none_2337538f0a5b7152.manifest
File versionNot applicable
File size704
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameX86_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21009_none_cddec4ffa4b7b81d.manifest
File versionNot applicable
File size158,590
Date (UTC)15-Jul-2011
Time (UTC)10:31
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_ae6772a25a6baa3eb8e656270c85c24d_31bf3856ad364e35_6.1.7600.21009_none_8cbe8be210f6cb8c.manifest
File versionNot applicable
File size1,058
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameAmd64_c1228e2a6fcdd3869e81cd1517323718_31bf3856ad364e35_6.1.7600.21009_none_3f8352e724cfffcd.manifest
File versionNot applicable
File size708
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameAmd64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21009_none_29fd60835d152953.manifest
File versionNot applicable
File size158,596
Date (UTC)15-Jul-2011
Time (UTC)10:36
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,114
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameWow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21009_none_34520ad59175eb4e.manifest
File versionNot applicable
File size94,348
Date (UTC)15-Jul-2011
Time (UTC)07:44
PlatformNot applicable
Additional files for all supported IA-64based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_b61313b14677cc11e1d11710696219cd_31bf3856ad364e35_6.1.7600.21009_none_efda78583603733a.manifest
File versionNot applicable
File size1,056
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameIa64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21009_none_cde068f5a4b5c119.manifest
File versionNot applicable
File size154,585
Date (UTC)15-Jul-2011
Time (UTC)08:40
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,690
Date (UTC)15-Jul-2011
Time (UTC)10:25
PlatformNot applicable
File nameWow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21009_none_34520ad59175eb4e.manifest
File versionNot applicable
File size94,348
Date (UTC)15-Jul-2011
Time (UTC)07:44
PlatformNot applicable

Properties

Article ID: 2580149 - Last Review: August 10, 2011 - 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 kbexpertiseadvanced kbsurveynew KB2580149

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