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



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

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.
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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