Can't access OO Central via IP address

I can launch my OO Central just fine from

https://localhost:8443/oo or https://127.0.0.1:8443/oo

but NOT when I use https://fully.qualified.domain.name:8443/oo or https://xx.xx.xx.xx:8443/oo

where xx.xx.xx.xx is the IP address of the machine. What could be the problem?