IPsec traffic may be blocked when a computer that is running Windows 7 or Windows Server 2008 R2 is behind HLB equipment

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Article ID: 2579729 - View products that this article applies to.
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SYMPTOMS

Assume that you apply IPsec policies on a computer that is running Windows 7 or Windows Server 2008 R2 and that is located behind hardware load balancing (HLB) equipment in a network environment. In this situation, you may be unable to access a website that is hosted on the computer until the timer for the security association (SA) expires.

Note HLB equipment behaves like a proxy server for client traffic to the computer. Therefore, the computer may believe all traffic is coming from the same source address.

CAUSE

This issue occurs because the hardcoded zombie value of 10 in IPsec policies is too small when it is used to clean up zombie connections between the source and destination IP addresses. This leads to blocked access to destination server resources until existing security associations (SAs) expire during heavy workloads in a network environment that uses both IPsec policies and HLB equipment.

RESOLUTION

After you install this hotfix, you can configure the zombie value manually by configuring the IkeNumEstablishedForInitialQuery registry entry. This enables you to configure a larger value to support the number of concurrent connections that are expected from a single IP address. The recommended value should be at least double the number of unique peers that you expect to connect to a particular server. For example, if you expect 1,000 SAs the recommended value should be at least 2,000.

To enable the new value that is configured in the IkeNumEstablishedForInitialQuery registry entry for the IPsec module, run the following commands, or restart the computer.
net stop ikeext
net start ikeext
As soon as all steps are performed, the computer is ready to participate in an HLB and IPsec-supported network.

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 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

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
After you apply the hotfix package, to have us configure the zombie value for you, go to the "Fix it for me" section. If you prefer to configure the zombie value yourself, go to the "Let me fix it myself" section.

Fix it for me



To configure the zombie value automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.


Fix this problem
Microsoft Fix it 50858


Notes
  • Install the hotfix in the "Hotfix download available" section at the top of this Knowledge Base article before you run this Fix it solution.
  • This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
  • If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.

Then, go to the "Did this fix the problem?" section.



Let me fix it myself

To configure the zombie value, follow these steps to create the necessary registry entries:
  1. Click Start
    Collapse this imageExpand this image
    start button
    , type regedit in the Search programs and files box, and then press ENTER.
    Collapse this imageExpand this image
    UAC
    If you are prompted for an administrator password, type the password. If you are prompted for confirmation, provide confirmation.
  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IKEEXT\Parameters
  3. On the Edit menu, point to New, and then click DWORD (32-bit) Value.
  4. Type IkeNumEstablishedForInitialQuery, and then press ENTER.
  5. Right-click IkeNumEstablishedForInitialQuery, and then click Modify.
  6. In the Value data box, type 0000c350, and then click OK.
  7. Exit Registry Editor.

Did this fix the problem?

  • Check whether the problem is fixed. If the problem is fixed, you are finished with this section. If the problem is not fixed, you can contact support.
  • We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the "Fix it for me" blog or send us an email.

Restart requirement

You do not have to 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
  • 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
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, extremely important 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 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
Bfe.dll6.1.7600.21012495,61620-Jul-201105:38x86
Fwpuclnt.dll6.1.7600.16385216,57614-Jul-200901:15x86
Ikeext.dll6.1.7600.21012670,20820-Jul-201105:39x86
Networksecurity-ppdlic.xrm-msNot applicable3,02820-Jul-201105:51Not applicable
Nshwfp.dll6.1.7600.21012657,92020-Jul-201105:41x86
Wfp.mofNot applicable82210-Jun-200921:32Not applicable
Bfe.dll6.1.7601.21774496,12820-Jul-201105:41x86
Fwpuclnt.dll6.1.7601.17514216,57620-Nov-201012:19x86
Ikeext.dll6.1.7601.21774674,81620-Jul-201105:44x86
Networksecurity-ppdlic.xrm-msNot applicable3,02820-Jul-201106:01Not applicable
Nshwfp.dll6.1.7601.21774657,92020-Jul-201105:47x86
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.dll6.1.7600.21012705,02420-Jul-201106:55x64
Fwpuclnt.dll6.1.7600.16385324,09614-Jul-200901:40x64
Ikeext.dll6.1.7600.21012849,40820-Jul-201106:57x64
Networksecurity-ppdlic.xrm-msNot applicable3,02820-Jul-201107:18Not applicable
Nshwfp.dll6.1.7600.21012832,00020-Jul-201107:04x64
Wfp.mofNot applicable82210-Jun-200920:51Not applicable
Bfe.dll6.1.7601.21774706,56020-Jul-201105:18x64
Fwpuclnt.dll6.1.7601.21774324,09620-Jul-201105:20x64
Ikeext.dll6.1.7601.21774854,52820-Jul-201105:20x64
Networksecurity-ppdlic.xrm-msNot applicable3,02820-Jul-201105:36Not applicable
Nshwfp.dll6.1.7601.21774832,00020-Jul-201105:23x64
Wfp.mofNot applicable82210-Jun-200920:51Not applicable
Fwpuclnt.dll6.1.7600.21012216,57620-Jul-201105:39x86
Nshwfp.dll6.1.7600.21012657,92020-Jul-201105:41x86
Wfp.mofNot applicable82222-Jul-200923:17Not applicable
Fwpuclnt.dll6.1.7601.21774216,57620-Jul-201105:43x86
Nshwfp.dll6.1.7601.21774657,92020-Jul-201105:47x86
Wfp.mofNot applicable82212-Nov-201023:57Not applicable
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Bfe.dll6.1.7600.210121,074,17620-Jul-201105:31IA-64
Fwpuclnt.dll6.1.7600.21012566,27220-Jul-201105:32IA-64
Ikeext.dll6.1.7600.210121,475,07220-Jul-201105:33IA-64
Networksecurity-ppdlic.xrm-msNot applicable3,02820-Jul-201105:47Not applicable
Nshwfp.dll6.1.7600.210121,114,11220-Jul-201105:35IA-64
Wfp.mofNot applicable82210-Jun-200920:57Not applicable
Bfe.dll6.1.7601.217741,074,17620-Jul-201104:18IA-64
Fwpuclnt.dll6.1.7601.21774566,27220-Jul-201104:19IA-64
Ikeext.dll6.1.7601.217741,485,82420-Jul-201104:19IA-64
Networksecurity-ppdlic.xrm-msNot applicable3,02820-Jul-201104:35Not applicable
Nshwfp.dll6.1.7601.217741,114,11220-Jul-201104:21IA-64
Wfp.mofNot applicable82210-Jun-200920:57Not applicable
Fwpuclnt.dll6.1.7600.21012216,57620-Jul-201105:39x86
Nshwfp.dll6.1.7600.21012657,92020-Jul-201105:41x86
Wfp.mofNot applicable82222-Jul-200923:17Not applicable
Fwpuclnt.dll6.1.7601.21774216,57620-Jul-201105:43x86
Nshwfp.dll6.1.7601.21774657,92020-Jul-201105:47x86
Wfp.mofNot applicable82212-Nov-201023:57Not applicable

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)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameX86_5df40c7d9edf1d599491a528a0944348_31bf3856ad364e35_6.1.7601.21774_none_d4875423985bd009.manifest
File versionNot applicable
File size704
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameX86_e7e7836a6072ea350861ac52589f09ed_31bf3856ad364e35_6.1.7600.21012_none_849fe91f86b3a7de.manifest
File versionNot applicable
File size704
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameX86_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_cdccf30da4c622ad.manifest
File versionNot applicable
File size158,590
Date (UTC)20-Jul-2011
Time (UTC)09:42
PlatformNot applicable
File nameX86_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_cf7498fda21b35ab.manifest
File versionNot applicable
File size158,590
Date (UTC)20-Jul-2011
Time (UTC)09:42
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_3592ebb5669ed87d09e53d6826311863_31bf3856ad364e35_6.1.7600.21012_none_0839d75fd3c06e13.manifest
File versionNot applicable
File size708
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameAmd64_569ab1ea3611e52447d476ce6ceaec03_31bf3856ad364e35_6.1.7601.21774_none_a1c56a51656a8eaa.manifest
File versionNot applicable
File size1,058
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameAmd64_88fdf5a38a5ce9167011cbea7c3d3f96_31bf3856ad364e35_6.1.7600.21012_none_66bf42631a9bb79f.manifest
File versionNot applicable
File size1,058
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameAmd64_f22f3172c747e14bf9e1fbfdc2841602_31bf3856ad364e35_6.1.7601.21774_none_d2502861389ce15e.manifest
File versionNot applicable
File size708
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameAmd64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_29eb8e915d2393e3.manifest
File versionNot applicable
File size158,596
Date (UTC)20-Jul-2011
Time (UTC)09:48
PlatformNot applicable
File nameAmd64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_2b9334815a78a6e1.manifest
File versionNot applicable
File size154,588
Date (UTC)20-Jul-2011
Time (UTC)06:58
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size3,215
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameWow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_344038e3918455de.manifest
File versionNot applicable
File size94,348
Date (UTC)20-Jul-2011
Time (UTC)05:59
PlatformNot applicable
File nameWow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_35e7ded38ed968dc.manifest
File versionNot applicable
File size94,348
Date (UTC)20-Jul-2011
Time (UTC)06:06
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_e27f7077d042502a23dad9c87dddace9_31bf3856ad364e35_6.1.7600.21012_none_1f4bfaeb1fc89a65.manifest
File versionNot applicable
File size1,056
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameIa64_e3cb4ef836c68bc61bef4e7ee51689ef_31bf3856ad364e35_6.1.7601.21774_none_1a4711e0e0be21c8.manifest
File versionNot applicable
File size1,056
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameIa64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_cdce9703a4c42ba9.manifest
File versionNot applicable
File size154,585
Date (UTC)20-Jul-2011
Time (UTC)06:56
PlatformNot applicable
File nameIa64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_cf763cf3a2193ea7.manifest
File versionNot applicable
File size154,585
Date (UTC)20-Jul-2011
Time (UTC)06:56
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,168
Date (UTC)20-Jul-2011
Time (UTC)09:35
PlatformNot applicable
File nameWow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_344038e3918455de.manifest
File versionNot applicable
File size94,348
Date (UTC)20-Jul-2011
Time (UTC)05:59
PlatformNot applicable
File nameWow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_35e7ded38ed968dc.manifest
File versionNot applicable
File size94,348
Date (UTC)20-Jul-2011
Time (UTC)06:06
PlatformNot applicable

Properties

Article ID: 2579729 - Last Review: May 2, 2012 - Revision: 3.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter kbfixme kbmsifixme KB2579729

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