I'm trying to get a laptop with a cisco cb21/a/b/g authenticated to my network using eap-fast. ADU version is 4.1. Also, using the cisco acs se 4.0. When I boot the laptop, the authentication starts but fails. No failed attempts entry in the acs log. A laptop with windows xp right next to the windows 2k laptop will authenticate everytime. Is it something with windows 2k?