Some routers agree to forward a request towards an external ip from the local area network, but as a general rule, it is not possible to use the external address to reach a http server because the router blocks the outgoing weft. The only known means is to connect to his Web server by using an external proxy server.
I want to clarify that there are particular cases, but that it remains exptionnel. And it is not taken into account with the use of a Dynamic DNS.
You can find in the forum some topic to configure a router, if self-test is good , the router work correctly with the extenal IP, you can use a second computer to test your server through the local network IP of HFS (generaly 192.168.1.x).
that's all.
хорошая храбрость.