Microsoft KB Archive/872861

= You cannot connect to Internet-based Web sites after you use Ipconfig.exe to set a class ID on a Windows 2000-based DHCP client =

Article ID: 872861

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 3
 * Microsoft Windows 2000 Service Pack 4

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SYMPTOMS
After you use the Ipconfig.exe utility to set and to enable a Dynamic Host Configuration Protocol (DHCP) Class ID on a DHCP client computer, you can no longer connect to Internet-based Web sites.. You were able to connect to the same Internet Web sites before you set the DHCP Class ID.

Note This issue occurs specifically in Microsoft Windows 2000 Service Pack 3 (SP3) and in Windows 2000 Service Pack 4 (SP4).



CAUSE
This issue occurs because the DHCP client does not obtain proxy information from DHCP option 252.



WORKAROUND
To work around this issue, remove the DHCP class ID. To do this, follow these steps:
 * 1) Click Start, click Run, type Cmd.exe, and then click OK.
 * 2) At the command prompt, type Ipconfig /setclassid *, and then press ENTER.
 * 3) Restart your computer.
 * 4) Test your Internet connectivity again.



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
This problem is scheduled to be fixed in the next Windows 2000 service pack.



MORE INFORMATION
For additional information about how to enable Proxy Autodiscovery in Windows 2000, click the following article number to view the article in the Microsoft Knowledge Base:

252898 How to enable Proxy Autodiscovery in Windows 2000

For additional information about how to configure DHCP class ID on a Windows 2000 DHCP client, click the following article number to view the article in the Microsoft Knowledge Base:

235272 How to configure DHCP class ID on a Windows 2000 DHCP client

Keywords: kbwinservnetwork kbnetwork kbbug kbtshoot kbprb KB872861

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