[RT-AX86U] Can't open ports

[Neo-ST]

I was behind CGNAT, but sent an email to my ISP the other day and today received my public WAN IP for the first time.
Went to WAN - Port forwarding, enabled Port forwarding.
Typed in service name, protocol, external port and internal ip.
Clicked OK.

Opened my browser, went to check open port tool website, port still closed.

Tried rebooting the router, my computer, different computer, different IPs, different ports, different port checkers... it's always closed.

What seems to be the problem ?

FW is latest. Router runs smoothly otherwise.

 

[ColinTaylor]

You have to have a service actively listening on the port for it to show as open.

 

[Neo-ST]

You have to have a service actively listening on the port for it to show as open.

You are, once again, correct. I didn't know that service must be running. Tested now again and everything works
Thanks!