Nick Howitt wrote:

Not so sure. I believe the app manipulates the firewall as necessary.

True, but it does also depend on where and how Port 80 is shut .. if it's just on the server, fine - but if it's closed (eg) on a seperate router, there's a problem .. and that's what keeps being forgotten - especially if the server is setup as standalone, with port forwarding carried out in a router!

There's a BIG difference between a COS system setup as a gateway and directly connected to the 'net, and a standalone with a seperate router and port forwarding! The question just never seems to get asked when someone complains that they can't get something to work from outside the local network.