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The DhcpRequestParams function returns ERROR_SUCCESS and no data in Windows XP with Service Pack 2 or in Windows XP Tablet PC Edition 2005

Article ID: 919250

Hotfix Download Available

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SYMPTOMS

Consider the following scenario:

Microsoft Windows XP Service Pack 2 or Microsoft Windows XP Tablet PC Edition 2005 is installed on your computer.

Note The features and components in Windows XP with Service Pack 2 are included in Windows XP Tablet PC Edition 2005.
A user class was defined on your computer by using the following command at a command prompt:
ipconfig /setclassid * Class_Name
In this command, Class_Name is a placeholder for the name of the user class.
You use a program that uses the DhcpRequestParams function to retrieve a configuration setting from a Dynamic Host Configuration Protocol (DHCP) server.
You set the ClassId attribute to NULL.

In this scenario, the DhcpRequestParams function returns ERROR_SUCCESS. However, the function returns no data to the program. This problem occurs even though the DHCP server returns all the required information.

This problem occurs when your computer is configured to use a user class.

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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 this specific problem.

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, submit a request to 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=support

(http://support.microsoft.com/contactus/?ws=support)

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 have Windows XP Service Pack 2 installed.

Restart requirement

You must restart your computer after you apply this hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

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File name	File version	File size	Date	Time	Platform
Dhcpcsvc.dll	5.1.2600.2951	112,128	13-Jul-2006	14:05	x86

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STATUS

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

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MORE INFORMATION

When you perform a network trace, you can see the Windows XP client send a DHCP INFORM packet. In a DHCP INFORM packet, the Windows XP client sends the following information:

A request for the required DHCP options
The Windows XP client user class information

The reply from the DHCP server includes all the required information for the user class. However, the client information does not receive this information.

When this problem occurs, you may see a network trace that resembles the following.

Dhcp: Boot Request, MsgType = INFORM, TransactionID = 0xA7B5FCF4
    Client IP address: 10.0.0.1
    Your (client) IP address: 0.0.0.0
    Next server IP address: 0.0.0.0
    Relay agent IP address: 0.0.0.0
    Client MAC address: 00:03:ff:49:96:7c
    Server host name not given
    Boot file name not given
    Magic cookie: (OK)
    Option 53: DHCP Message Type = DHCP Inform
    Option 77: User Class Information (5 bytes)
        Length: 5 UINT8(s)
        UserClassInfor: test1
    Option 61: Client identifier
        Hardware type: Ethernet
        Client MAC address: 00:03:ff:49:96:7c
    Option 12: Host Name = "xp2"
    Option 60: Vendor class identifier = "MSFT 5.0"
    Option 55: Parameter Request List
        ...
        222 = Private
    End Option

Dhcp: Boot Reply, MsgType = ACK, TransactionID = 0xA7B5FCF4
    Client IP address: 10.0.0.12
    Your (client) IP address: 0.0.0.0
    Next server IP address: 0.0.0.0
    Relay agent IP address: 0.0.0.0
    Client MAC address: 00:03:ff:49:96:7c
    Server host name not given
    Boot file name not given
    Magic cookie: (OK)
    Option 53: DHCP Message Type = DHCP ACK
    Option 54: Server Identifier = 10.0.0.254
    Option 1: Subnet Mask = 255.255.255.0
    Option 15: Domain Name = "fabrikam.com"
    Option 6: Domain Name Server = 10.0.0.253
    Option 44: NetBIOS over TCP/IP Name Server = 10.0.0.253
    Option 46: NetBIOS over TCP/IP Node Type = H-node
    Option 222: Private (2 bytes)
        Code: UNHANDLED DHCP OPTION CODE, 222(0xDE)
        Length: 2 UINT8(s)
        Value: DD
    End Option

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915

(http://support.microsoft.com/kb/816915/ )

New file naming schema for Microsoft Windows software update packages

For more information about the terms that are used in this article, click the following article number to view the article in the Microsoft Knowledge Base:

824684

(http://support.microsoft.com/kb/824684/ )

Description of the standard terminology that is used to describe Microsoft software updates

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