Hi timtrace,
Are you connecting via the public Internet? The documentation was written from the perspective of connecting via the Internet, and so there is no point in opening the UDP51320 port as the broadcasts wouldn’t get routed anyway.
The UDP51320 broadcasts are use to discover iLive (and other A&H devices) on the local sub-net, and the replies to these are used to list the units available. If connecting via the Internet then this is normally done by typing the IP Addr of the router that is set to port-forward to the iLive. If you have a firewall on your local sub-net then it may be worth opening up port 51320 as well to get the above functionality.
Regards,
Antony I. Jackson
Software Manager
Allen and Heath.