Launch sabnzbd like this:
python SABnzbd.py -d -s :8080
then try connecting to:http://192.168.178.30:8080/sabnzbd/
if that doesn't work try launching using
python SABnzbd.py -d -s 0.0.0.0:8080
and connecting to the same address.
or find your sabnzbd.ini in ~/.sabnzbd/sabnzbd.ini and change the hostname to either blank (might be "") 0.0.0.0 or 192.168.178.30 and restart sabnzbd.