can't connect to radius server

Hi, I think I have my radius server configured properly (I followed the configuration advice in http://tldp.org/HOWTO/html_single/8021X-HOWTO/). I can get it running (using radiusd -X) and see all the expected output. I have also configured my AP to point to the correct location, and it is pingable from the radius server. However, when I try to connect, user validation always fails. And the radius server (which is in debug mode) doesn't show me anything. It's like nothing is connecting to it at all. I also tried to test it using NTRadPing, and his won't connect either. Any help or suggestions here would be appreciated. I am running version 1.1.1 of freeRADIUS. Thanks, Simon