Symptoms

Consider the following scenario:

  • You define a Dynamic Host Configuration Protocol (DHCP) User class ID on a computer that is running Windows 7 or Windows Server 2008 R2. To do this, you open a command prompt, you type the following command, and then you press Enter:

    ipconfig /setclassid * Class_Name

    Note In this command, "Class_Name" is a placeholder for the name of the user class.

  • You run an application that uses the DhcpRequestParams function to retrieve a configuration setting from a DHCP server.

  • The application calls the DhcpRequestParams function together with the ClassId parameter that is set to the NULL value.

In this scenario, the DhcpRequestParams function returns an "ERROR_SUCCESS" result. However, the function returns no data to the application even though the DHCP server returns all the information that is required.

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 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 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

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must 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


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, 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
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical 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 7 and for Windows Server 2008 R2" 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 7

File name

File version

File size

Date

Time

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:24

Dhcpcmonitor.dll

6.1.7600.16385

11,264

14-Jul-2009

01:15

Dhcpcore.dll

6.1.7600.21285

256,000

25-Jul-2012

19:52

Dhcpcore6.dll

6.1.7600.21285

193,024

25-Jul-2012

19:52

Dhcpcsvc.dll

6.1.7600.16385

61,952

14-Jul-2009

01:15

Dhcpcsvc6.dll

6.1.7600.16385

43,008

14-Jul-2009

01:15

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:24

Dhcpcmonitor.dll

6.1.7600.16385

11,264

14-Jul-2009

01:15

Dhcpcore.dll

6.1.7601.22070

256,512

25-Jul-2012

19:38

Dhcpcore6.dll

6.1.7601.22070

193,024

25-Jul-2012

19:38

Dhcpcsvc.dll

6.1.7600.16385

61,952

14-Jul-2009

01:15

Dhcpcsvc6.dll

6.1.7600.16385

43,008

14-Jul-2009

01:15

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

File name

File version

File size

Date

Time

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

13,824

14-Jul-2009

01:40

Dhcpcore.dll

6.1.7600.21285

315,904

25-Jul-2012

20:38

Dhcpcore6.dll

6.1.7600.21285

224,256

25-Jul-2012

20:38

Dhcpcsvc.dll

6.1.7600.16385

87,040

14-Jul-2009

01:40

Dhcpcsvc6.dll

6.1.7600.16385

54,272

14-Jul-2009

01:40

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

13,824

14-Jul-2009

01:40

Dhcpcore.dll

6.1.7601.22070

318,976

25-Jul-2012

20:32

Dhcpcore6.dll

6.1.7601.22070

224,256

25-Jul-2012

20:32

Dhcpcsvc.dll

6.1.7600.16385

87,040

14-Jul-2009

01:40

Dhcpcsvc6.dll

6.1.7600.16385

54,272

14-Jul-2009

01:40

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

File name

File version

File size

Date

Time

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

27,136

14-Jul-2009

01:46

Dhcpcore.dll

6.1.7600.21285

617,984

25-Jul-2012

19:28

Dhcpcore6.dll

6.1.7600.21285

463,360

25-Jul-2012

19:28

Dhcpcsvc.dll

6.1.7600.16385

162,304

14-Jul-2009

01:46

Dhcpcsvc6.dll

6.1.7600.16385

86,528

14-Jul-2009

01:46

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

27,136

14-Jul-2009

01:46

Dhcpcore.dll

6.1.7601.22070

620,544

25-Jul-2012

19:33

Dhcpcore6.dll

6.1.7601.22070

463,360

25-Jul-2012

19:33

Dhcpcsvc.dll

6.1.7600.16385

162,304

14-Jul-2009

01:46

Dhcpcsvc6.dll

6.1.7600.16385

86,528

14-Jul-2009

01:46

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

X86_b6aea4a7e08c1f8347750de7c2644082_31bf3856ad364e35_6.1.7601.22070_none_28542c1fd696e7da.manifest

File version

Not applicable

File size

703

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

X86_ce1ff4f4f6c23fb3f8bf1d985afd9284_31bf3856ad364e35_6.1.7600.21285_none_d44fe0bb21bd8b0a.manifest

File version

Not applicable

File size

703

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

X86_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7600.21285_none_d7ba01faa9012408.manifest

File version

Not applicable

File size

95,014

Date (UTC)

25-Jul-2012

Time (UTC)

23:20

File name

X86_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.22070_none_d9a62d7aa623f550.manifest

File version

Not applicable

File size

95,014

Date (UTC)

25-Jul-2012

Time (UTC)

23:20

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

File name

Amd64_21f9568621069175bf84dddaa0bd3fba_31bf3856ad364e35_6.1.7600.21285_none_36f7507039a7ac53.manifest

File version

Not applicable

File size

707

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Amd64_5a3e8e3ddefbe458fdb36ab71350e21a_31bf3856ad364e35_6.1.7600.21285_none_810f7f1d2072289d.manifest

File version

Not applicable

File size

1,054

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Amd64_8dcfd9ff72e2a27df5840d80e75f3440_31bf3856ad364e35_6.1.7601.22070_none_5301afc0c422eb7e.manifest

File version

Not applicable

File size

707

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Amd64_e3f7a61bd5414ee69e09b67eaf4cde4e_31bf3856ad364e35_6.1.7601.22070_none_58250ba7275a1885.manifest

File version

Not applicable

File size

1,054

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Amd64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7600.21285_none_33d89d7e615e953e.manifest

File version

Not applicable

File size

95,032

Date (UTC)

25-Jul-2012

Time (UTC)

23:24

File name

Amd64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.22070_none_35c4c8fe5e816686.manifest

File version

Not applicable

File size

95,032

Date (UTC)

25-Jul-2012

Time (UTC)

23:24

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

File name

Ia64_489b65cf82e9217b4d23a910d5230e5b_31bf3856ad364e35_6.1.7601.22070_none_f64c18d79a2f927c.manifest

File version

Not applicable

File size

1,052

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Ia64_b9fb54d39ad7ac86c7c9f39b785b0082_31bf3856ad364e35_6.1.7600.21285_none_754a625fba0b006d.manifest

File version

Not applicable

File size

1,052

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Ia64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7600.21285_none_d7bba5f0a8ff2d04.manifest

File version

Not applicable

File size

95,023

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

File name

Ia64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.22070_none_d9a7d170a621fe4c.manifest

File version

Not applicable

File size

95,023

Date (UTC)

25-Jul-2012

Time (UTC)

23:15

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Any additional feedback? (Optional)

Thank you for your feedback!

×