Do a traceroute against the servers... PS4 may go through PSN to the servers and therefore not hit the same problem.
This is to determine if there is a routing problem over which you have no control.

You can also try WTFast as I wrote in my first reply. If that works, it is definitely routing problems somewhere.

Traceroute can help you figure out WHERE such a problem is. It's not about checking port forwarding.

I assume you have registered the PC code on the mogstation since you can log in at the launcher already.

Goblin have an IP of 199.91.189.26

If you need to see any other IP, use the Windows Resource Manager to see which IP's the game is trying to use.