Hi Lakehavasu, it is common to forward a tcp port for Opennap (8888 & 7777)
However the problem your seeing could well be ISP related its pretty easy for them to block transfers of whatever flavour they choose as Opennap is not encrypted in that area.
This is a freeware TCP viewerhttps://www.novirusthanks.org/products/connections-viewer/
This is an online Port Tester you can test withhttps://www.yougetsignal.com/tools/open-ports/
What I would like you to do is the following:
Download the TCP Viewer and run that, then fire up your Opennap client and ask a friend to try downloading from you, with the TCP viewing tool you can see what port is being used and then you can check whether that specific port is unmolested by any firewall or router/modem issue using the online Port Tester.