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

Applies to: Windows Vista Service Pack 2Windows Server 2008 Service Pack 2Windows 7

Symptoms


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.

Cause


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

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 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: 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 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

Registry information

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

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 Vista and Windows Server 2008 file information notes
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.
    VersionProductSR_LevelService branch
    6.0.600
    2.
    22xxx
    Windows Vista and Windows Server 2008SP2LDR
  • 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.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Nlb-unattend.exe6.0.6002.2268237,88819-Jul-201113:31x86
Nlbcfg.dll6.0.6002.2268266,56019-Jul-201115:10x86
Nlbmigplugin.dll6.0.6002.22682135,68019-Jul-201115:10x86
Nlbmprov.dll6.0.6002.22682102,40019-Jul-201115:10x86
Nlbmprov.mofNot Applicable8,37219-Jul-201111:23Not Applicable
Nlbmprovuninstall.mofNot Applicable13819-Jul-201111:23Not Applicable
Nlbtrace.mofNot Applicable2,39315-Mar-201106:01Not Applicable
Wlbsctrl.dll6.0.6002.2268280,38419-Jul-201115:12x86
Wlbsprov.dll6.0.6002.22682147,45619-Jul-201115:12x86
Wlbsprov.mofNot Applicable131,04419-Jul-201111:23Not Applicable
Wlbsprovuninstall.mofNot Applicable13819-Jul-201111:23Not Applicable
Nlb.sys6.0.6002.22682203,26419-Jul-201113:31x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Nlb-unattend.exe6.0.6002.2268238,91219-Jul-201114:00x64
Nlbcfg.dll6.0.6002.2268278,84819-Jul-201115:36x64
Nlbmigplugin.dll6.0.6002.22682163,84019-Jul-201115:36x64
Nlbmprov.dll6.0.6002.22682122,36819-Jul-201115:36x64
Nlbmprov.mofNot Applicable8,37219-Jul-201111:20Not Applicable
Nlbmprovuninstall.mofNot Applicable13819-Jul-201111:20Not Applicable
Nlbtrace.mofNot Applicable2,39315-Mar-201105:02Not Applicable
Wlbsctrl.dll6.0.6002.2268293,18419-Jul-201115:38x64
Wlbsprov.dll6.0.6002.22682226,30419-Jul-201115:38x64
Wlbsprov.mofNot Applicable131,04419-Jul-201111:20Not Applicable
Wlbsprovuninstall.mofNot Applicable13819-Jul-201111:20Not Applicable
Nlb.sys6.0.6002.22682251,39219-Jul-201114:01x64
For all supported IA-64-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Nlb-unattend.exe6.0.6002.2268281,92019-Jul-201114:09IA-64
Nlbcfg.dll6.0.6002.22682173,05619-Jul-201115:30IA-64
Nlbmigplugin.dll6.0.6002.22682346,62419-Jul-201115:30IA-64
Nlbmprov.dll6.0.6002.22682273,92019-Jul-201115:30IA-64
Nlbmprov.mofNot Applicable8,37219-Jul-201111:49Not Applicable
Nlbmprovuninstall.mofNot Applicable13819-Jul-201111:49Not Applicable
Nlbtrace.mofNot Applicable2,39315-Mar-201105:53Not Applicable
Wlbsctrl.dll6.0.6002.22682204,28819-Jul-201115:32IA-64
Wlbsprov.dll6.0.6002.22682461,82419-Jul-201115:32IA-64
Wlbsprov.mofNot Applicable131,04419-Jul-201111:49Not Applicable
Wlbsprovuninstall.mofNot Applicable13819-Jul-201111:49Not Applicable
Nlb.sys6.0.6002.22682590,33619-Jul-201114:09IA-64
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.
    VersionProductSR_LevelService branch
    6.1.760
    0.
    20xxx
    Windows 7 and Windows Server 2008 R2RTMLDR
    6.1.760
    1.
    21xxx
    Windows 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 x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Nlb.sys6.1.7600.20889340,48027-Jan-201104:38x64
Nlb.sys6.1.7601.21649340,48026-Jan-201104:57x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Nlb.sys6.1.7600.20889780,80027-Jan-201103:56IA-64
Nlb.sys6.1.7601.21649780,80026-Jan-201104:15IA-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

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

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008
File nameUpdate.mum
File versionNot Applicable
File size2,251
Date (UTC)20-Jul-2011
Time (UTC)07:31
PlatformNot Applicable
File nameX86_1e5f0c08491fd7672cd614905eba272d_31bf3856ad364e35_6.0.6002.22682_none_b8e9eca9c83b8e66.manifest
File versionNot Applicable
File size713
Date (UTC)20-Jul-2011
Time (UTC)07:31
PlatformNot Applicable
File nameX86_268b404963f89a73e81e111211ac581a_31bf3856ad364e35_6.0.6002.22682_none_52c0b6a8059746aa.manifest
File versionNot Applicable
File size722
Date (UTC)20-Jul-2011
Time (UTC)07:31
PlatformNot Applicable
File nameX86_microsoft-windows-n..kloadbalancing-core_31bf3856ad364e35_6.0.6002.22682_none_169358e5e7c1ed13.manifest
File versionNot Applicable
File size30,460
Date (UTC)19-Jul-2011
Time (UTC)15:28
PlatformNot Applicable
File nameX86_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.0.6002.22682_none_b02596f12eece7fc.manifest
File versionNot Applicable
File size4,343
Date (UTC)19-Jul-2011
Time (UTC)15:28
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
File nameAmd64_1351ee0bf92760661d77ed5fa2652b67_31bf3856ad364e35_6.0.6002.22682_none_4107ae521835cb11.manifest
File versionNot Applicable
File size717
Date (UTC)20-Jul-2011
Time (UTC)07:32
PlatformNot Applicable
File nameAmd64_528e5778be1f0d9acd951cab74c30a4c_31bf3856ad364e35_6.0.6002.22682_none_5083a00f2042c11b.manifest
File versionNot Applicable
File size726
Date (UTC)20-Jul-2011
Time (UTC)07:32
PlatformNot Applicable
File nameAmd64_microsoft-windows-n..kloadbalancing-core_31bf3856ad364e35_6.0.6002.22682_none_72b1f469a01f5e49.manifest
File versionNot Applicable
File size30,789
Date (UTC)19-Jul-2011
Time (UTC)15:58
PlatformNot Applicable
File nameAmd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.0.6002.22682_none_0c443274e74a5932.manifest
File versionNot Applicable
File size4,355
Date (UTC)19-Jul-2011
Time (UTC)15:57
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size2,267
Date (UTC)20-Jul-2011
Time (UTC)07:32
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
File nameIa64_62e49df12e16e41fd8f4c5e2b50aa773_31bf3856ad364e35_6.0.6002.22682_none_a6df062807a7f6bd.manifest
File versionNot Applicable
File size724
Date (UTC)20-Jul-2011
Time (UTC)07:31
PlatformNot Applicable
File nameIa64_78635215d3bf1091845989b6fa647f0a_31bf3856ad364e35_6.0.6002.22682_none_ccae9fc60cc32e3e.manifest
File versionNot Applicable
File size715
Date (UTC)20-Jul-2011
Time (UTC)07:31
PlatformNot Applicable
File nameIa64_microsoft-windows-n..kloadbalancing-core_31bf3856ad364e35_6.0.6002.22682_none_1694fcdbe7bff60f.manifest
File versionNot Applicable
File size30,768
Date (UTC)19-Jul-2011
Time (UTC)15:41
PlatformNot Applicable
File nameIa64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.0.6002.22682_none_b0273ae72eeaf0f8.manifest
File versionNot Applicable
File size4,349
Date (UTC)19-Jul-2011
Time (UTC)15:41
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,592
Date (UTC)20-Jul-2011
Time (UTC)07:31
PlatformNot Applicable

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_dce1141dd2e6622d00109f467cff41b7_31bf3856ad364e35_6.1.7601.21649_none_691b5cc798d0def4.manifest
File versionNot applicable
File size726
Date (UTC)27-Jan-2011
Time (UTC)20:46
PlatformNot applicable
File nameAmd64_f00fe6b5adf68473de43d80ad4a78b54_31bf3856ad364e35_6.1.7600.20889_none_23002811c5b2b97d.manifest
File versionNot applicable
File size726
Date (UTC)27-Jan-2011
Time (UTC)20:46
PlatformNot applicable
File nameAmd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7600.20889_none_0a8c8f0c4b34f809.manifest
File versionNot applicable
File size2,669
Date (UTC)27-Jan-2011
Time (UTC)07:00
PlatformNot applicable
File nameAmd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7601.21649_none_0c9e2bc2483af431.manifest
File versionNot applicable
File size2,669
Date (UTC)26-Jan-2011
Time (UTC)07:17
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,419
Date (UTC)27-Jan-2011
Time (UTC)20:46
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_0cdd9db24449a334ac6544c639395393_31bf3856ad364e35_6.1.7601.21649_none_364a227c70543a4e.manifest
File versionNot applicable
File size724
Date (UTC)27-Jan-2011
Time (UTC)20:46
PlatformNot applicable
File nameIa64_208f99ee2dc99d306c37abf54738ce3f_31bf3856ad364e35_6.1.7600.20889_none_957a8c89922c2d8a.manifest
File versionNot applicable
File size724
Date (UTC)27-Jan-2011
Time (UTC)20:46
PlatformNot applicable
File nameIa64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7600.20889_none_ae6f977e92d58fcf.manifest
File versionNot applicable
File size2,667
Date (UTC)27-Jan-2011
Time (UTC)07:02
PlatformNot applicable
File nameIa64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7601.21649_none_b08134348fdb8bf7.manifest
File versionNot applicable
File size2,667
Date (UTC)26-Jan-2011
Time (UTC)07:20
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,965
Date (UTC)27-Jan-2011
Time (UTC)20:46
PlatformNot applicable