Noob - Freeradius, wireless access point authentication

hey,

I recently installed freeradius 1.0.2 on Ubuntu Warty (kernel 2.6.8).
The idea is to use the radius server with a mysql database to
authenticate users into a wireless network, using a 3com access point.
The configuration seems straightforward (uncomment sql in the
authorize and accounting sections on the radiusd.conf, as well as
adding the access points and their IPs to clients.conf. I also took
care of the secret key and all that).
I tested the server locally with radtest and worked without problems,=20
I then configured the access point, but., when I try to join the
wireless network on a win xp client, it hangs ... no authentication
happens, it never prompts me for a username or a password. It simply
hangs stating that "windows was unable to find a certificate to log
you on"... Is that because I need to generate a certificate with
openSSl? isn it just possible to authenticate without one? Am I
missing something?

Thanks for your help!

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