Microsoft KB Archive/922861

= Network connectivity may be lost when you use DHCP to configure IP settings on a computer that is running Windows XP with Service Pack 1 =

Article ID: 922861

Article Last Modified on 8/29/2007

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APPLIES TO

 Microsoft Windows XP Service Pack 1, when used with:  Microsoft Windows XP Professional

 Microsoft Windows XP Home Edition 

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SYMPTOMS
You configure a computer that is running Microsoft Windows XP with Service Pack 1 (SP1) in the following way:
 * You use Dynamic Host Configuration Protocol (DHCP) to configure IP settings.
 * You configure fallback options in case the client computer cannot connect to a DHCP server.

This configuration works even when the DHCP server is unavailable. However, the configuration may not work if you configure a user class on the computer by typing the following command:

ipconfig /setclassid *

If you configure a class ID, the fallback IP configuration of the client computer cannot be used. Therefore, the IP addresses of the default gateway, of the DNS servers, and of the WINS servers are unavailable. Network connectivity may be lost.



RESOLUTION
A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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

Prerequisites
To apply this hotfix, you must have Windows XP Service Pack 1 (SP1) installed.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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 item in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
When this problem occurs, the ipconfig /all command displays information that resembles the following: <pre class="fixed_text">Windows IP Configuration

Host Name. . . . . . . . . . . . : xp1 Primary Dns Suffix. . . . . . . : contoso.com Node Type. . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No       WINS Proxy Enabled. . . . . . . . : No       DNS Suffix Search List. . . . . . : contoso.com

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix. :        Description. . . . . . . . . . . : 3Com 3C920 Integrated Fast Ethernet Controller Physical Address. . . . . . . . . : 00-01-02-03-04-05       Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled. . . . : Yes Autoconfiguration IP Address. . . : 10.10.99.99       Subnet Mask. . . . . . . . . . . : 255.255.255.0       Default Gateway. . . . . . . . . :       DHCP Class ID. . . . . . . . . . : myclassid Additionally, registry entries are removed from the following registry subkey:

These registry entries may include the DhcpDefaultGateway entry.

For more information about a similar problem in Windows XP with Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

915357 Network connectivity may be lost when you use DHCP to configure IP settings on a Windows XP Service Pack 2-based computer

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

Keywords: kbfix kbbug kbhotfixserver kbqfe kbpubtypekc KB922861

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