Failed to run Freeradius on CentoS

listen { type = "auth" ipaddr = 127.0.0.0 port = 1812 Failed binding to authentication address 127.0.0.0 port 1812 as server inner-tunnel: Address already in use /usr/local/etc/raddb/sites-enabled/inner-tunnel[32]: Error binding to port for 127.0.0.0 port 1812 I tried to check if duplicate version of freeradius and changing to use specifc ip no luck. Can any throw some light and help me out ? regards Bhanu