Thanks a lot Phil for your help. It's OK now. With SecureW2 and PAP on the user's PC and using ttls I add these lines to my configuration:
Modules { ... eap { default_eap_type = ttls ... gtc { auth_type = PAP } ttls { default_eap_type = gtc } ... } ... } - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html