Hi, Thank you for yesterday's suggestion. I am able to run RADIUS server in debug mode. I have few more queries. Query1: When I send a request from IP:1645 port(gateway which acts as Radius client) to Radius server, i get an error as "request from unknown client IP.1645 ignored. I get reject message from server. Message authenticator is not present in request under AVP attributes. Query2: When I send Radius request from one host to another, request reaches server and server will never respond to the same. Message authenticate value is present. I have set message_authenticator value to no in radiusd.conf Why is the behavior different in these 2 case? In both the cases I sniffed it on ubuntu PC where server is running. I am sure request is reaching PC, but I am not sure if its hitting application. Should I have my Radius user details in my sql table. If yes, can you please tell me how do I do that. Can you please share the link. I am new to freeradius and ubuntu as well. Could you please help me in this regard. Thanks, Kavya