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The primary IP address is reset to after you disconnect and reconnect the network cable in Windows XP

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

You configure two or more static Internet Protocol (IP) addresses on a computer that is running Microsoft Windows XP. Then, you disconnect and reconnect the network cable. In this scenario, the primary IP address is reset to The primary IP address is not restored after the network cable is reconnected.
This problem occurs because of a race condition that involves the TCP/IP driver and the DHCP client service.

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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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: 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.


To apply this hotfix, you must have Microsoft Windows XP Service Pack 1 installed.

Restart requirement

You must restart the computer after you apply this software update.

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 tool in Control Panel.
Windows XP with Service Pack 1, 32-bit versions
File nameFile versionFile sizeDateTime
Windows XP with Service Pack 2, 32-bit versions
File nameFile versionFile sizeDateTime
Windows XP, Itanium-based versions
File nameFile versionFile sizeDateTimePlatformService branch
Dhcpcsvc.dll5.1.2600.1687322,04816-May-200517:13IA-64Not applicable
To work around this problem, disable Media Sensing for TCP/IP.For more information about how to disable Media Sensing, click the following article number to view the article in the Microsoft Knowledge Base:
239924 How to disable Media Sensing for TCP/IP in Windows
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Article ID: 896062 - Last Review: 08/29/2007 14:36:07 - Revision: 2.2

  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional 64-Bit Edition (Itanium)
  • kbautohotfix kbqfe kbhotfixserver kbfix kbwinxppresp3fix kbprb KB896062