How to solve the mystical riddle of my ADSL WIFI TP-LINK TD854W router?

Question

Computer networks

Although PFPortChecker shows that the ports are open and 2ip that the ports are closed? When you try to forward / open ports UDP 48800-49000 UDP 6672, 61455, 61456, 61457 and 61458 for games do not open? TCP ports 80-443 in the router - virtual server - ip address Lan I enter local ip do not open, I enter static ip opened and only some and namely TCP ports? but why not open locally? Did you check the UDP ports, launched the game and checked it outside in 2ip on the phone and laptop, are the UDP ports closed? Although PFPortChecker shows that the ports are open and 2ip that the ports are closed? I created an inbound / outbound rule in the windows 10 firewall and disabled it does not help. The provider said that the ports are not blocked and they are open by default.

Answer 1

playing GTA 5 online means she should listen to the port

This is another confusion caused by the "how to make NAT open" instructions.
Open and forwarded are confused, with regards to GTA and other sessions - ports must be open to the outside, i.e. so that traffic from your client reaches external addresses, and not in the opposite direction.
Why - yes, because the whole world sits behind NAT.