Microsoft KB Archive/885453

= PEAP authentication is not successful when you connect to a third-party RADIUS server =

Article ID: 885453

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Service Pack 2
 * Microsoft Windows XP Service Pack 2

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SYMPTOMS
After you install Microsoft Windows XP Service Pack 2 (SP2), your Protected Extensible Authentication Protocol (PEAP) connection does not authenticate successfully. This failure occurs during an authentication attempt to a third-party Remote Authentication Dial-In User Service (RADIUS) server.

Note Sometimes the initial connection may authenticate successfully, but subsequent fast-connect authentication attempts may not connect successfully.



CAUSE
This issue occurs if your third-party RADIUS server uses a different method to calculate the Extensible Authentication Protocol (EAP) Type:Length:Value format (EAP-TLV) id than the method that Windows XP uses.

Note Windows XP SP2 added additional validity checking on the EAP-TLV data that is embedded in the PEAP packets.



Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
You must have Windows XP Service Pack 2 (SP2) installed to install this hotfix.

Restart information
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix is not replaced by any other hotfix.

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.   Date         Time   Version        Size     File name   Platform 25-Sep-2004 01:39  5.1.2600.2523  112,128  Rastls.dll  x86



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.



MORE INFORMATION
For additional information about the standard terminology that is used to describe Microsoft software updates, 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

Keywords: kbbug kbfix kbqfe kbwinxppresp3fix kbwinxpsp3fix kbhotfixserver KB885453

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