When you disable and then re-enable the LAN-side network adapter on a Windows XP SP3-based computer that is configured as a Connection Sharing host, a client computer on the network cannot access the Internet

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Article ID: 951830 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You are running a Windows XP Service Pack 3 (SP3)-based computer that has two network adapters installed.
  • You enable the Internet Connection Sharing feature, and then you configure the computer as a Connection Sharing host.
  • You connect another computer to the Connection Sharing network. This computer functions as a Connection Sharing client.

    Note In this Connection Sharing network, one network adapter on the host computer is connected to the Internet, and the other network adapter is connected to a local area network (LAN).
  • You disable and then re-enable the LAN-side network adapter on the host computer.
In this scenario, the Connection Sharing client computer cannot access the Internet through the Connection Sharing network. If you try to use a tool such as Nslookup.exe to resolve the domain name on the client computer, the operation is unsuccessful. Additionally, you receive an error message that resembles the following:
DNS server is not responding.
Note If the LAN-side network adapter is a USB-based network adapter, the issue also occurs when you physically disconnect and then reconnect this network adapter.

RESOLUTION

Update information

The following file is available for download from the Microsoft Download Center:

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Download
Download the Update for Windows XP (KB951830) package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites

To apply this update, you must have Windows XP Service Pack 2 (SP2) or a later service pack installed.

Restart requirement

You must restart the computer after you apply this update.

Update replacement information

This update does not replace any other previously released updates.

Registry information

To use this update, you do not have to make any changes to the registry.

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.
Windows XP with SP 3, x86-based versions
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File nameFile versionFile sizeDateTimePlatform
Ipnathlp.dll5.1.2600.5584330,75221-Apr-200818:44x86

WORKAROUND

To work around this issue, use one of the following methods.

Method 1

Restart the Connection Sharing host computer.

Method 2

Restart the Windows Firewall/Internet Connection Sharing service on the Connection Sharing host computer. To do this, run the net stop sharedaccess command to stop the service, and then run the net start sharedaccess command to start it.

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 Internet Connection Sharing, click the following article numbers to view the articles in the Microsoft Knowledge Base:
310563 Description of Internet Connection Sharing in Windows XP
314066 How to enable Internet Connection Sharing on a home or a small office network connection in Windows XP
For more information about how to use the NSlookup.exe utility, click the following article number to view the article in the Microsoft Knowledge Base:
200525 Using NSlookup.exe
For more information, 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

Properties

Article ID: 951830 - Last Review: October 8, 2011 - Revision: 3.0
APPLIES TO
  • Microsoft Windows XP Service Pack 3, when used with:
    • Microsoft Windows XP Home Edition
    • Microsoft Windows XP Professional
Keywords: 
kbexpertiseadvanced kbfix kbqfe KB951830

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