Why can't port forwarding work?

Question

Nginx

I’m sitting on an ubuntu 18.04
router: on dsl-2640-u
I decided to show my friend the awesome site that I made, but I don’t have money for the server, so I’m doing it from my computer
, everything went well until I started forwarding ports. (I have a static ip address)

postgres I included in this list for tests that also failed
when switching to an external ip, I was thrown to the router settings
checked the port through the
port was closed, opened it through the port trigger

when switching again the same story,
I decided that the problem was in the Ubuntu firewall, but
sudo ufw status :

thought the ports were closed, but
sudo netstat -ntulp :

everything works on localhost

dhcp is configured

what could be the problem?
PS Friend means everyone who has my external IP address

Answer 1

Settings need to be done in the virtual server, triggered port is different.
The muzzle opens, because. By default, it listens on port 80.
Solution
1. Forward port 8080 from outside to internal 80. Give a friend a link like http:/1.1.1.1:8080
2. Search in the browser for the opportunity to move it to another port, let's say the same 8080.

Answer 2

Run ngrok in console
Command - ngrok http 80
You will be given a link that a friend can follow. Ngrok creates a tunnel.