Auth Problem

Dear List, I have been using Freeradius for couple of years. Freeradius is installed on FreeBSD with mpd. All is working fine with Mac based Calling-station. I have problem with one username. With that particular user nothing works I mean he can bypass password, expiration and calling-station. Rest all users denied access if their expiration date reached or accessing from un authorized MAC. I am unable to control that particular user. Any help will be appreciated. Best regards, Fazal Ahmed Malik