From the hosting computer log on to localhost:591. If that doesn't work then IWP isn;t working at all.
From another computer in the same LAN and the same subnet log on to 10.0.0.9:591 (if that is the IP of the hosting computer. If that works IWP is correctly hosted and available to guest users.
From outside the network log on to http://A:591 If the port-forwarding from router-to router works then that is all you should need (although i suspect there is an easier way that all the router-hops.)
That worked! First time! Accessed from iPhone on safari via cell service! Off and running, thank you very much!