Faild binding to auth address error

[Matthew Budrey]

Hello,
Got a newly built Freeradius server running on Ubuntu server that is
showing the following error;

radiusd: #### Opening IP addresses and Ports ####
listen {
        type = "auth"
        ipaddr = *
        port = 0
   limit {
        max_connections = 16
        lifetime = 0
        idle_timeout = 30
   }
Failed binding to auth address * port 1812 bound to server default:
Address already in use
/etc/freeradius/3.0/sites-enabled/default[59]: Error binding to port
for 0.0.0.0 port 1812

By stopping the service, the error goes away, but as soon as the
service is restarted the error is back, see below output of the
running instances.

administrator at zotacradius:~$ sudo ps ax | grep radius
   2366 ?        Ssl    0:00 /usr/sbin/freeradius -f
   2986 pts/1    S+     0:00 grep --color=auto radius

 administrator at zotacradius:~$ sudo systemctl stop freeradius
administrator at zotacradius:~$ sudo ps ax | grep radius
   3022 pts/1    S+     0:00 grep --color=auto radius

After spending a lot of time looking for ways to resolve this issue
today, they all talk about processes already using the ports, assuming
I'm reading this correctly, then that's not what I'm seeing as there
is only the active instance and the grep process.

Has anyone got any suggestions on how to resolve this at all?

Regards
Matt