Why don't online games work on playstation 4?

Question

Computer networks

On ps4, while checking the Internet, it says "NAT type failed", network games do not work, ps plus is, you can go into the games themselves, but there is no selection of players, and the party too.

Answer 1

Try to enable UPnP on the router, or make the PS4 DMZ ip the host.

Answer 2

The ports are probably closed. You need to look at the settings of the router or what you have instead of the gateway.