You can have issues with self hosting on a residential connection if your provider gives you a CGNAT connection and not a dedicated one. With CGNAT (Carrier Grade Network Adress Translation) your line is shared between multiple users. So are the ports, so imagine you're trying to open a port on your router and expect to reach from internet to your home using that port. Your carrier may have splitted the whole available ports pool between the 4 customers behind your IP, and when you try to reach : your packets may go Somewhere else. This thing is ok for when you use internet for classical browsing, not when you try to have traffic initiated from internet up to your home