Symptoms

Consider the following scenario:

  • You have a network for which the Network Access Protection (NAP) feature is enabled.

  • You configure a NAP-enabled Dynamic Host Configuration Protocol (DHCP) server on a computer that is running Windows Server 2008 or Windows Server 2008 R2 in the network.

  • A Windows XP Service Pack 3 (SP3) client that is not NAP compliant joins the network and tries to obtain IP addresses from the NAP-enabled DHCP server.

In this scenario, the Windows XP SP3 client that is not NAP compliant may receive fully accessible IP addresses from the NAP-enabled DHCP server. The expected behavior is that the client can access limited IP address from the DHCP server at any time.

Additionally, if you run the following command on the client several times, you find that the DHCP server gives the restricted IP address and the fully accessible IP address every other time:

ipconfig /release & ipconfig /renew

Cause

The issue occurs because the NAP-enabled DHCP server incorrectly handles the options in the DHCP packets from Windows XP SP3 clients. It causes the DHCP server to bypass NAP authentication and directly grants fully accessible IP address to the Windows XP SP3 clients that are not NAP compliant.

Resolution

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 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.

Prerequisites

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

  • Windows Server 2008

  • Windows Server 2008 Service Pack 2 (SP2)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

Additionally, you must have the DHCP server role installed.
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 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

Restart requirements

You must stop the DHCP service before you apply this hotfix, and then restart the DHCP service after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) 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 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, 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

    6.0.6001.22xxx

    Windows Server 2008

    SP1

    LDR

    6.0.6002.22xxx

    Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into the original release version of Windows Server 2008.

  • 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" 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 Server 2008

File name

File version

File size

Date

Time

Platform

Dhcpserver.events.xml

Not Applicable

581

04-Mar-2010

05:48

Not Applicable

Dhcpssvc.dll

6.0.6001.22945

490,496

18-Jul-2011

14:50

x86

Dhcpserver.events.xml

Not Applicable

581

15-Mar-2011

05:19

Not Applicable

Dhcpssvc.dll

6.0.6002.22681

492,032

18-Jul-2011

15:22

x86

For all supported x64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Dhcpserver.events.xml

Not Applicable

581

26-Feb-2010

04:06

Not Applicable

Dhcpssvc.dll

6.0.6001.22945

618,496

18-Jul-2011

15:02

x64

Dhcpserver.events.xml

Not Applicable

581

15-Mar-2011

04:35

Not Applicable

Dhcpssvc.dll

6.0.6002.22681

620,544

18-Jul-2011

15:32

x64

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.

    Version

    Product

    SR_Level

    Service branch

    6.1.760
    0.
    20xxx

    Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.
    21xxx

    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" 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 Server 2008 R2

File name

File version

File size

Date

Time

Platform

Dhcpserver.events.xml

Not Applicable

600

10-Jun-2009

20:34

Not Applicable

Dhcpssvc.dll

6.1.7600.20967

729,088

14-May-2011

07:33

x64

Dhcpserver.events.xml

Not Applicable

600

05-Nov-2010

01:52

Not Applicable

Dhcpssvc.dll

6.1.7601.21728

729,088

14-May-2011

07:11

x64

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 Server 2008

Additional files for all supported x86-based versions of Windows Server 2008

File name

Update.mum

File version

Not Applicable

File size

2,238

Date (UTC)

19-Jul-2011

Time (UTC)

07:17

Platform

Not Applicable

File name

X86_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.0.6001.22945_none_296d4762b0c458d9.manifest

File version

Not Applicable

File size

141,628

Date (UTC)

18-Jul-2011

Time (UTC)

15:08

Platform

Not Applicable

File name

X86_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.0.6002.22681_none_2b247872ae0eb865.manifest

File version

Not Applicable

File size

141,628

Date (UTC)

18-Jul-2011

Time (UTC)

15:43

Platform

Not Applicable

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

File name

Amd64_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.0.6001.22945_none_858be2e66921ca0f.manifest

File version

Not Applicable

File size

141,672

Date (UTC)

18-Jul-2011

Time (UTC)

15:17

Platform

Not Applicable

File name

Amd64_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.0.6002.22681_none_874313f6666c299b.manifest

File version

Not Applicable

File size

141,672

Date (UTC)

18-Jul-2011

Time (UTC)

15:55

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,254

Date (UTC)

19-Jul-2011

Time (UTC)

07:17

Platform

Not Applicable

Additional file information for Windows Server 2008 R2

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

File name

Amd64_2337abaac2afa50fcb46a0fcde670d75_31bf3856ad364e35_6.1.7601.21728_none_898b3936775b224f.manifest

File version

Not Applicable

File size

709

Date (UTC)

16-May-2011

Time (UTC)

12:19

Platform

Not Applicable

File name

Amd64_d9abfd4516df878dc66fc3ac8daba3bb_31bf3856ad364e35_6.1.7600.20967_none_e15af16d9ff03894.manifest

File version

Not Applicable

File size

709

Date (UTC)

16-May-2011

Time (UTC)

12:19

Platform

Not Applicable

File name

Amd64_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.1.7600.20967_none_85a01201ca477460.manifest

File version

Not Applicable

File size

194,101

Date (UTC)

14-May-2011

Time (UTC)

08:10

Platform

Not Applicable

File name

Amd64_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.1.7601.21728_none_87b2af01c74c89df.manifest

File version

Not Applicable

File size

194,101

Date (UTC)

14-May-2011

Time (UTC)

08:48

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,391

Date (UTC)

16-May-2011

Time (UTC)

12:19

Platform

Not Applicable

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