Dawgs, I received the following error when starting debug mode or issuing "freeradius reload" and catching the error in radius.log: Tue Mar 24 16:16:05 2009 : Error: Failed binding to socket: Address already in use Tue Mar 24 16:16:05 2009 : Error: /etc/raddb/radiusd.conf[240]: Error binding to port for 0.0.0.0 port 1812 I disabled IPv6 and verified if there is another service running on this port... RADIUS:~ # lsof -i:1812 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME radiusd 3568 root 5u IPv4 10046 0t0 UDP *:1812 RADIUS:~ # netstat -unpl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name udp 0 0 0.0.0.0:1812 0.0.0.0:* 3568/radiusd udp 0 0 0.0.0.0:1813 0.0.0.0:* 3568/radiusd udp 0 0 0.0.0.0:1814 0.0.0.0:* 3568/radiusd udp 0 0 0.0.0.0:43956 0.0.0.0:* 2564/avahi-daemon: udp 0 0 0.0.0.0:5353 0.0.0.0:* 2564/avahi-daemon: udp 0 0 0.0.0.0:111 0.0.0.0:* 2347/portmap udp 0 0 0.0.0.0:631 0.0.0.0:* 2663/cupsd According to the outputs above there is just one service running on this port... I don't know what else I can do. I saw all topics related to my problem but no one gave me a solution.