Failed binding to authentication address * port 1812: Address already in use
/etc/freeradius/radiusd.conf: Error binding to port for 0.0.0.0 port 1812
ps aux | grep free
ps ax | grep radius
check for the process already running.
kill -9 PID
then start radius in debug mode.
/usr/sbin/freeradius -X you probably have one started manually and one from init.d, and they are arguing over port access.
After all, when you kill the PID.
Just start the freeradius from demon.
Now to confirm everything is working fine, restart the server.
If there is any issue, Comments here.