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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 ikeextAs 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=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

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 WindowsAfter 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.




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 start button , type regedit in the Search programs and files box, and then press ENTER.

    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:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    0.21xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.17xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • 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

File name

File version

File size

Date

Time

Platform

Bfe.dll

6.1.7600.21012

495,616

20-Jul-2011

05:38

x86

Fwpuclnt.dll

6.1.7600.16385

216,576

14-Jul-2009

01:15

x86

Ikeext.dll

6.1.7600.21012

670,208

20-Jul-2011

05:39

x86

Networksecurity-ppdlic.xrm-ms

Not applicable

3,028

20-Jul-2011

05:51

Not applicable

Nshwfp.dll

6.1.7600.21012

657,920

20-Jul-2011

05:41

x86

Wfp.mof

Not applicable

822

10-Jun-2009

21:32

Not applicable

Bfe.dll

6.1.7601.21774

496,128

20-Jul-2011

05:41

x86

Fwpuclnt.dll

6.1.7601.17514

216,576

20-Nov-2010

12:19

x86

Ikeext.dll

6.1.7601.21774

674,816

20-Jul-2011

05:44

x86

Networksecurity-ppdlic.xrm-ms

Not applicable

3,028

20-Jul-2011

06:01

Not applicable

Nshwfp.dll

6.1.7601.21774

657,920

20-Jul-2011

05:47

x86

Wfp.mof

Not applicable

822

10-Jun-2009

21:32

Not applicable

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

File name

File version

File size

Date

Time

Platform

Bfe.dll

6.1.7600.21012

705,024

20-Jul-2011

06:55

x64

Fwpuclnt.dll

6.1.7600.16385

324,096

14-Jul-2009

01:40

x64

Ikeext.dll

6.1.7600.21012

849,408

20-Jul-2011

06:57

x64

Networksecurity-ppdlic.xrm-ms

Not applicable

3,028

20-Jul-2011

07:18

Not applicable

Nshwfp.dll

6.1.7600.21012

832,000

20-Jul-2011

07:04

x64

Wfp.mof

Not applicable

822

10-Jun-2009

20:51

Not applicable

Bfe.dll

6.1.7601.21774

706,560

20-Jul-2011

05:18

x64

Fwpuclnt.dll

6.1.7601.21774

324,096

20-Jul-2011

05:20

x64

Ikeext.dll

6.1.7601.21774

854,528

20-Jul-2011

05:20

x64

Networksecurity-ppdlic.xrm-ms

Not applicable

3,028

20-Jul-2011

05:36

Not applicable

Nshwfp.dll

6.1.7601.21774

832,000

20-Jul-2011

05:23

x64

Wfp.mof

Not applicable

822

10-Jun-2009

20:51

Not applicable

Fwpuclnt.dll

6.1.7600.21012

216,576

20-Jul-2011

05:39

x86

Nshwfp.dll

6.1.7600.21012

657,920

20-Jul-2011

05:41

x86

Wfp.mof

Not applicable

822

22-Jul-2009

23:17

Not applicable

Fwpuclnt.dll

6.1.7601.21774

216,576

20-Jul-2011

05:43

x86

Nshwfp.dll

6.1.7601.21774

657,920

20-Jul-2011

05:47

x86

Wfp.mof

Not applicable

822

12-Nov-2010

23:57

Not applicable

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

File name

File version

File size

Date

Time

Platform

Bfe.dll

6.1.7600.21012

1,074,176

20-Jul-2011

05:31

IA-64

Fwpuclnt.dll

6.1.7600.21012

566,272

20-Jul-2011

05:32

IA-64

Ikeext.dll

6.1.7600.21012

1,475,072

20-Jul-2011

05:33

IA-64

Networksecurity-ppdlic.xrm-ms

Not applicable

3,028

20-Jul-2011

05:47

Not applicable

Nshwfp.dll

6.1.7600.21012

1,114,112

20-Jul-2011

05:35

IA-64

Wfp.mof

Not applicable

822

10-Jun-2009

20:57

Not applicable

Bfe.dll

6.1.7601.21774

1,074,176

20-Jul-2011

04:18

IA-64

Fwpuclnt.dll

6.1.7601.21774

566,272

20-Jul-2011

04:19

IA-64

Ikeext.dll

6.1.7601.21774

1,485,824

20-Jul-2011

04:19

IA-64

Networksecurity-ppdlic.xrm-ms

Not applicable

3,028

20-Jul-2011

04:35

Not applicable

Nshwfp.dll

6.1.7601.21774

1,114,112

20-Jul-2011

04:21

IA-64

Wfp.mof

Not applicable

822

10-Jun-2009

20:57

Not applicable

Fwpuclnt.dll

6.1.7600.21012

216,576

20-Jul-2011

05:39

x86

Nshwfp.dll

6.1.7600.21012

657,920

20-Jul-2011

05:41

x86

Wfp.mof

Not applicable

822

22-Jul-2009

23:17

Not applicable

Fwpuclnt.dll

6.1.7601.21774

216,576

20-Jul-2011

05:43

x86

Nshwfp.dll

6.1.7601.21774

657,920

20-Jul-2011

05:47

x86

Wfp.mof

Not applicable

822

12-Nov-2010

23:57

Not 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

File name

Update.mum

File version

Not applicable

File size

2,773

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

X86_5df40c7d9edf1d599491a528a0944348_31bf3856ad364e35_6.1.7601.21774_none_d4875423985bd009.manifest

File version

Not applicable

File size

704

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

X86_e7e7836a6072ea350861ac52589f09ed_31bf3856ad364e35_6.1.7600.21012_none_849fe91f86b3a7de.manifest

File version

Not applicable

File size

704

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

X86_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_cdccf30da4c622ad.manifest

File version

Not applicable

File size

158,590

Date (UTC)

20-Jul-2011

Time (UTC)

09:42

Platform

Not applicable

File name

X86_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_cf7498fda21b35ab.manifest

File version

Not applicable

File size

158,590

Date (UTC)

20-Jul-2011

Time (UTC)

09:42

Platform

Not applicable

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

File name

Amd64_3592ebb5669ed87d09e53d6826311863_31bf3856ad364e35_6.1.7600.21012_none_0839d75fd3c06e13.manifest

File version

Not applicable

File size

708

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Amd64_569ab1ea3611e52447d476ce6ceaec03_31bf3856ad364e35_6.1.7601.21774_none_a1c56a51656a8eaa.manifest

File version

Not applicable

File size

1,058

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Amd64_88fdf5a38a5ce9167011cbea7c3d3f96_31bf3856ad364e35_6.1.7600.21012_none_66bf42631a9bb79f.manifest

File version

Not applicable

File size

1,058

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Amd64_f22f3172c747e14bf9e1fbfdc2841602_31bf3856ad364e35_6.1.7601.21774_none_d2502861389ce15e.manifest

File version

Not applicable

File size

708

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Amd64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_29eb8e915d2393e3.manifest

File version

Not applicable

File size

158,596

Date (UTC)

20-Jul-2011

Time (UTC)

09:48

Platform

Not applicable

File name

Amd64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_2b9334815a78a6e1.manifest

File version

Not applicable

File size

154,588

Date (UTC)

20-Jul-2011

Time (UTC)

06:58

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,215

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Wow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_344038e3918455de.manifest

File version

Not applicable

File size

94,348

Date (UTC)

20-Jul-2011

Time (UTC)

05:59

Platform

Not applicable

File name

Wow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_35e7ded38ed968dc.manifest

File version

Not applicable

File size

94,348

Date (UTC)

20-Jul-2011

Time (UTC)

06:06

Platform

Not applicable

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

File name

Ia64_e27f7077d042502a23dad9c87dddace9_31bf3856ad364e35_6.1.7600.21012_none_1f4bfaeb1fc89a65.manifest

File version

Not applicable

File size

1,056

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Ia64_e3cb4ef836c68bc61bef4e7ee51689ef_31bf3856ad364e35_6.1.7601.21774_none_1a4711e0e0be21c8.manifest

File version

Not applicable

File size

1,056

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Ia64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_cdce9703a4c42ba9.manifest

File version

Not applicable

File size

154,585

Date (UTC)

20-Jul-2011

Time (UTC)

06:56

Platform

Not applicable

File name

Ia64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_cf763cf3a2193ea7.manifest

File version

Not applicable

File size

154,585

Date (UTC)

20-Jul-2011

Time (UTC)

06:56

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,168

Date (UTC)

20-Jul-2011

Time (UTC)

09:35

Platform

Not applicable

File name

Wow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7600.21012_none_344038e3918455de.manifest

File version

Not applicable

File size

94,348

Date (UTC)

20-Jul-2011

Time (UTC)

05:59

Platform

Not applicable

File name

Wow64_microsoft-windows-network-security_31bf3856ad364e35_6.1.7601.21774_none_35e7ded38ed968dc.manifest

File version

Not applicable

File size

94,348

Date (UTC)

20-Jul-2011

Time (UTC)

06:06

Platform

Not applicable

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