Thanks. Xfinity (my ISP) supports only TCP and UDP for Xfi Gateway and not HTTP/HTTPS.
The thing which I don't know is how to remove Xfi Gateway and use my own gateway/router.
The thing which I don't know is how to remove Xfi Gateway and use my own gateway/router.
So port forward TCP and you'll be good.
Back in the day, DynDNS actually allowed the IP to DNS as a free service.