Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

If you have no issues with your PS4, but can't log in on the PC, it sounds like it's something local to that device.

How is the PC connected to the internet? Does it have a wired or wireless connection?

Make sure that any anti-virus or firewall you have has an exception for the game.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!