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Wireless 802.1x authentication does not provide username/password prompt when using MD5 Challenge

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Article ID: KB10959 KB Last Updated: 11 Aug 2010Version: 3.0
Summary:

Symptoms:
Windows XP 802.1x client is trying to authenticate to a RADIUS server.  When the attempt is made to connect between the wireless NIC and the Wireless Access Point, no authentication challenge is presented.
Solution:
By default, Windows will send the Domain account information in the background for authentication through 802.1x when using PEAP MD5 Challenge.  The user will not get the opportunity to enter a different username/password combination, because of the cached username/password.  In order to force the wireless 802.1x client to challenge the user with a username/password, a registry item for EAPOL needs to be removed.

From the PC, go to Start > Run.  Enter regedit.  Browse to the registry path HKEY_CURRENT_USER\Software\Microsoft\Eapol.  Then, delete the folder EapInfo, including all of its contents.

Once this folder is removed, Windows will challenge the user with a username/password prompt.
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