I have a lot of problems with RADA authentication. When I start my tests the NAS (a stack of 4 3com 4400 24 port switches in a network of 100 switches) sends access requests to 2 freeradius servers (primary and secondary) asking for user authentication. All seems to work right (the radius servers reply requests sending "Login OK" after checking if username/password = MACaddress/MACaddress are in MySql database) but at one moment, the NAS sends the Access-Request with username a3Com and password a3Com. I added account a3Com/a3Com in database, and the radius servers answer "Login OK: [a3Com]", but the NAS go down with a warning that sounds like : "The RADIUS Authentication service is not responding". What is the mistake? Freeradius? 3com 4400 Switch? MySql? Debian? Netwok? Me? this is NAS request rad_recv: Access-Request packet from host 10.10.0.x:2049, id=57, length=87 User-Name = "a3Com" User-Password = "a3Com" NAS-Port-Type = Virtual NAS-IP-Address = 10.10.0.x Service-Type = Administrative-User Framed-MTU = 1024 Message-Authenticator = 0xebe2ebda3372940ad56d932c10457ff8 Processing the authorize section of radiusd.conf Diego Torto