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: 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.

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Update information

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

Download the Update for Windows XP (KB951830) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=3262D5BE-EB48-4FB1-AB4A-AF9F22F40166)

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 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

File name	File version	File size	Date	Time	Platform
Ipnathlp.dll	5.1.2600.5584	330,752	21-Apr-2008	18:44	x86

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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.

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

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For more information about Internet Connection Sharing, click the following article numbers to view the articles in the Microsoft Knowledge Base: 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: For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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