[Users] radius authentication

[Stefano Capitanio]

Ciao!

I'm trying to authenticate using Radius.
I've installed radiusclient-ng 0.5.2
i've configured radiusclient.conf with the IP address of the radius server.
I've configured SER with:
...
modparam("auth_radius", "radius_config", 
"/etc/radiusclient-ng/radiusclient.conf")
...
if (method=="REGISTER") {
if (!radius_www_authorize("example.it")) {
                                        www_challenge("example.it", "0");
                                        exit;
                        }
save("location");
}

but it doesn't work: there seem to be a problem in the client because 
there is no IP Packet that goes out directed to the radius server...
in the log of SER  i have  no errors...

thank you for any help,
Stefano