Hi, check the shared secret you have defined in clients.conf on the server.
check the shared secret you are using on the client check the server debug logs etc to see WHAT IP the client is coming through - if you are using a localhost address or name....if using the name it might be using another IP socket connection which may be matching one of the other default values present in clients.conf alan - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

