PEAP authentication is not successful when you connect to a third-party RADIUS server (885453)


The information in this article applies to:

  • Microsoft Windows XP Professional Service Pack 2 (SP2)
  • Microsoft Windows XP Home Edition Service Pack 2 (SP2)

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.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

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

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 "Applies to" 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

Modification Type:MinorLast Reviewed:6/1/2006
Keywords:kbQFE kbHotfixServer kbWinXPsp3fix kbWinXPpreSP3fix kbfix kbbug KB885453 kbAudEndUser kbAudITPRO
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