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A Windows XP Service Pack 3-based client computer cannot use the IEEE 802.1x authentication when you use PEAP with PEAP-MSCHAPv2 in a domain

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.

Consider the following scenario in an Active Directory domain network environment:
  • You configure a Windows Server 2008-based computer as the Network Policy Server (NPS).
  • You enable IEEE 802.1x authentication in the network.
  • You use Protected Extensible Authentication Protocol (PEAP) with Microsoft Challenge Handshake Authentication Protocol version 2 (PEAP-MSCHAPv2) in the network.
In this scenario, when a Windows XP Service Pack 3 (SP3)-based client computer tries to join the network by using the IEEE 802.1x authentication, the IEEE 802.1x authentication fails.

  • This problem occurs when you use a user account that uses a mandatory user profile.
  • This problem does not occur when you use a user account that uses a roaming user profile.

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.

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, submit a request to 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 Windows XP Service Pack 3 installed on the computer.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack

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.
Windows XP with Service Pack 3, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the wired networking with 802.1X authentication, visit the following Web site:For more information about Network Policy Server, visit the following Web sites:For more information about PEAP-MSCHAPv2, visit the following Web site:

Article ID: 969111 - Last Review: 01/30/2012 08:04:00 - Revision: 3.0

  • Microsoft Windows XP Professional
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