Why is my PSN not working PS4?
If your PS4 won't connect to the internet, the PlayStation Network may be offline. You should also make sure to check your Wi-Fi connection and reset or move your router and modem. You can also try adjusting your PS4's DNS settings as a final resort to fix connection issues
How to Fix It When Your PS4 Won't Connect to Wi-Fi
1. Check the status of the PlayStation Network. ...
2. Restart the modem and router.
3. Restart the PlayStation 4.
4. Confirm your Wi-Fi password is correct.
5. Move your PS4 closer to the wireless router.
6. Change the Wi-Fi network's channel number.
7. Change the DNS settings on the PS4.
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