NLB does not differentiate correctly between virtual IP addresses and dedicated IP addresses for ISATAP addresses in Windows 7, in Windows Server 2008 R2, in Windows Vista or in Windows Server 2008

When a Network Load Balancing (NLB) node tries to establish a connection to an IP version 6 (IPv6) resource by using Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) in Windows 7, in Windows Server 2008 R2, in Windows Vista or in Windows Server 2008, the connection gets load balanced unexpectedly.

Additionally, if an IPv6 client tries to connect to the dedicated IP address of an NLB node, the IPv6 address is converted to an ISATAP address, and the connection gets load balanced.

This issue occurs because NLB does not correctly differentiate between virtual IP addresses and dedicated IP addresses for ISATAP addresses.

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 that is 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 website:

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.

To apply this hotfix, you must be running one of the following operating systems:

  • Windows Vista Service Pack 2 (SP2)

  • Windows Server 2008 Service Pack 2 (SP2)

  • 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 Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

For more information about how to obtain a Windows 7 or a 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

You do not have to make any changes to the registry to use this hotfix.

You do not have to restart the computer after you apply this hotfix.

This hotfix does not replace a previously released hotfix.

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.

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" 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

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    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 and for Windows Vista" section. MUM files 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.

File name

File version

File size

Date

Time

Platform

Nlb-unattend.exe

6.0.6002.22682

37,888

19-Jul-2011

13:31

x86

Nlbcfg.dll

6.0.6002.22682

66,560

19-Jul-2011

15:10

x86

Nlbmigplugin.dll

6.0.6002.22682

135,680

19-Jul-2011

15:10

x86

Nlbmprov.dll

6.0.6002.22682

102,400

19-Jul-2011

15:10

x86

Nlbmprov.mof

Not Applicable

8,372

19-Jul-2011

11:23

Not Applicable

Nlbmprovuninstall.mof

Not Applicable

138

19-Jul-2011

11:23

Not Applicable

Nlbtrace.mof

Not Applicable

2,393

15-Mar-2011

06:01

Not Applicable

Wlbsctrl.dll

6.0.6002.22682

80,384

19-Jul-2011

15:12

x86

Wlbsprov.dll

6.0.6002.22682

147,456

19-Jul-2011

15:12

x86

Wlbsprov.mof

Not Applicable

131,044

19-Jul-2011

11:23

Not Applicable

Wlbsprovuninstall.mof

Not Applicable

138

19-Jul-2011

11:23

Not Applicable

Nlb.sys

6.0.6002.22682

203,264

19-Jul-2011

13:31

x86

File name

File version

File size

Date

Time

Platform

Nlb-unattend.exe

6.0.6002.22682

38,912

19-Jul-2011

14:00

x64

Nlbcfg.dll

6.0.6002.22682

78,848

19-Jul-2011

15:36

x64

Nlbmigplugin.dll

6.0.6002.22682

163,840

19-Jul-2011

15:36

x64

Nlbmprov.dll

6.0.6002.22682

122,368

19-Jul-2011

15:36

x64

Nlbmprov.mof

Not Applicable

8,372

19-Jul-2011

11:20

Not Applicable

Nlbmprovuninstall.mof

Not Applicable

138

19-Jul-2011

11:20

Not Applicable

Nlbtrace.mof

Not Applicable

2,393

15-Mar-2011

05:02

Not Applicable

Wlbsctrl.dll

6.0.6002.22682

93,184

19-Jul-2011

15:38

x64

Wlbsprov.dll

6.0.6002.22682

226,304

19-Jul-2011

15:38

x64

Wlbsprov.mof

Not Applicable

131,044

19-Jul-2011

11:20

Not Applicable

Wlbsprovuninstall.mof

Not Applicable

138

19-Jul-2011

11:20

Not Applicable

Nlb.sys

6.0.6002.22682

251,392

19-Jul-2011

14:01

x64

File name

File version

File size

Date

Time

Platform

Nlb-unattend.exe

6.0.6002.22682

81,920

19-Jul-2011

14:09

IA-64

Nlbcfg.dll

6.0.6002.22682

173,056

19-Jul-2011

15:30

IA-64

Nlbmigplugin.dll

6.0.6002.22682

346,624

19-Jul-2011

15:30

IA-64

Nlbmprov.dll

6.0.6002.22682

273,920

19-Jul-2011

15:30

IA-64

Nlbmprov.mof

Not Applicable

8,372

19-Jul-2011

11:49

Not Applicable

Nlbmprovuninstall.mof

Not Applicable

138

19-Jul-2011

11:49

Not Applicable

Nlbtrace.mof

Not Applicable

2,393

15-Mar-2011

05:53

Not Applicable

Wlbsctrl.dll

6.0.6002.22682

204,288

19-Jul-2011

15:32

IA-64

Wlbsprov.dll

6.0.6002.22682

461,824

19-Jul-2011

15:32

IA-64

Wlbsprov.mof

Not Applicable

131,044

19-Jul-2011

11:49

Not Applicable

Wlbsprovuninstall.mof

Not Applicable

138

19-Jul-2011

11:49

Not Applicable

Nlb.sys

6.0.6002.22682

590,336

19-Jul-2011

14:09

IA-64


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.

File name

File version

File size

Date

Time

Platform

Nlb.sys

6.1.7600.20889

340,480

27-Jan-2011

04:38

x64

Nlb.sys

6.1.7601.21649

340,480

26-Jan-2011

04:57

x64

File name

File version

File size

Date

Time

Platform

Nlb.sys

6.1.7600.20889

780,800

27-Jan-2011

03:56

IA-64

Nlb.sys

6.1.7601.21649

780,800

26-Jan-2011

04:15

IA-64

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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

For more information about IPv6 transition technologies, visit the following Microsoft webpage:

Introduction to IPv6 transition technologies

File name

Update.mum

File version

Not Applicable

File size

2,251

Date (UTC)

20-Jul-2011

Time (UTC)

07:31

Platform

Not Applicable

File name

X86_1e5f0c08491fd7672cd614905eba272d_31bf3856ad364e35_6.0.6002.22682_none_b8e9eca9c83b8e66.manifest

File version

Not Applicable

File size

713

Date (UTC)

20-Jul-2011

Time (UTC)

07:31

Platform

Not Applicable

File name

X86_268b404963f89a73e81e111211ac581a_31bf3856ad364e35_6.0.6002.22682_none_52c0b6a8059746aa.manifest

File version

Not Applicable

File size

722

Date (UTC)

20-Jul-2011

Time (UTC)

07:31

Platform

Not Applicable

File name

X86_microsoft-windows-n..kloadbalancing-core_31bf3856ad364e35_6.0.6002.22682_none_169358e5e7c1ed13.manifest

File version

Not Applicable

File size

30,460

Date (UTC)

19-Jul-2011

Time (UTC)

15:28

Platform

Not Applicable

File name

X86_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.0.6002.22682_none_b02596f12eece7fc.manifest

File version

Not Applicable

File size

4,343

Date (UTC)

19-Jul-2011

Time (UTC)

15:28

Platform

Not Applicable

File name

Amd64_1351ee0bf92760661d77ed5fa2652b67_31bf3856ad364e35_6.0.6002.22682_none_4107ae521835cb11.manifest

File version

Not Applicable

File size

717

Date (UTC)

20-Jul-2011

Time (UTC)

07:32

Platform

Not Applicable

File name

Amd64_528e5778be1f0d9acd951cab74c30a4c_31bf3856ad364e35_6.0.6002.22682_none_5083a00f2042c11b.manifest

File version

Not Applicable

File size

726

Date (UTC)

20-Jul-2011

Time (UTC)

07:32

Platform

Not Applicable

File name

Amd64_microsoft-windows-n..kloadbalancing-core_31bf3856ad364e35_6.0.6002.22682_none_72b1f469a01f5e49.manifest

File version

Not Applicable

File size

30,789

Date (UTC)

19-Jul-2011

Time (UTC)

15:58

Platform

Not Applicable

File name

Amd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.0.6002.22682_none_0c443274e74a5932.manifest

File version

Not Applicable

File size

4,355

Date (UTC)

19-Jul-2011

Time (UTC)

15:57

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,267

Date (UTC)

20-Jul-2011

Time (UTC)

07:32

Platform

Not Applicable

File name

Ia64_62e49df12e16e41fd8f4c5e2b50aa773_31bf3856ad364e35_6.0.6002.22682_none_a6df062807a7f6bd.manifest

File version

Not Applicable

File size

724

Date (UTC)

20-Jul-2011

Time (UTC)

07:31

Platform

Not Applicable

File name

Ia64_78635215d3bf1091845989b6fa647f0a_31bf3856ad364e35_6.0.6002.22682_none_ccae9fc60cc32e3e.manifest

File version

Not Applicable

File size

715

Date (UTC)

20-Jul-2011

Time (UTC)

07:31

Platform

Not Applicable

File name

Ia64_microsoft-windows-n..kloadbalancing-core_31bf3856ad364e35_6.0.6002.22682_none_1694fcdbe7bff60f.manifest

File version

Not Applicable

File size

30,768

Date (UTC)

19-Jul-2011

Time (UTC)

15:41

Platform

Not Applicable

File name

Ia64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.0.6002.22682_none_b0273ae72eeaf0f8.manifest

File version

Not Applicable

File size

4,349

Date (UTC)

19-Jul-2011

Time (UTC)

15:41

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,592

Date (UTC)

20-Jul-2011

Time (UTC)

07:31

Platform

Not Applicable

File name

Amd64_dce1141dd2e6622d00109f467cff41b7_31bf3856ad364e35_6.1.7601.21649_none_691b5cc798d0def4.manifest

File version

Not applicable

File size

726

Date (UTC)

27-Jan-2011

Time (UTC)

20:46

Platform

Not applicable

File name

Amd64_f00fe6b5adf68473de43d80ad4a78b54_31bf3856ad364e35_6.1.7600.20889_none_23002811c5b2b97d.manifest

File version

Not applicable

File size

726

Date (UTC)

27-Jan-2011

Time (UTC)

20:46

Platform

Not applicable

File name

Amd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7600.20889_none_0a8c8f0c4b34f809.manifest

File version

Not applicable

File size

2,669

Date (UTC)

27-Jan-2011

Time (UTC)

07:00

Platform

Not applicable

File name

Amd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7601.21649_none_0c9e2bc2483af431.manifest

File version

Not applicable

File size

2,669

Date (UTC)

26-Jan-2011

Time (UTC)

07:17

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,419

Date (UTC)

27-Jan-2011

Time (UTC)

20:46

Platform

Not applicable

File name

Ia64_0cdd9db24449a334ac6544c639395393_31bf3856ad364e35_6.1.7601.21649_none_364a227c70543a4e.manifest

File version

Not applicable

File size

724

Date (UTC)

27-Jan-2011

Time (UTC)

20:46

Platform

Not applicable

File name

Ia64_208f99ee2dc99d306c37abf54738ce3f_31bf3856ad364e35_6.1.7600.20889_none_957a8c89922c2d8a.manifest

File version

Not applicable

File size

724

Date (UTC)

27-Jan-2011

Time (UTC)

20:46

Platform

Not applicable

File name

Ia64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7600.20889_none_ae6f977e92d58fcf.manifest

File version

Not applicable

File size

2,667

Date (UTC)

27-Jan-2011

Time (UTC)

07:02

Platform

Not applicable

File name

Ia64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7601.21649_none_b08134348fdb8bf7.manifest

File version

Not applicable

File size

2,667

Date (UTC)

26-Jan-2011

Time (UTC)

07:20

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,965

Date (UTC)

27-Jan-2011

Time (UTC)

20:46

Platform

Not applicable

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