How to fix NW-31253-4

A network error occurred. Response from DNS server is delayed or unstable.

Restart the PlayStation®4 console system and router.
Check if your Internet Service Provider is carrying out any maintenance on their network.
The following port numbers are used by the PlayStation™Network servers to connect to the Internet. Make sure they are not blocked by your router:
- TCP: 80, 443, 3478, 3479, 3480
- UDP: 3478, 3479
If you have been using a specific DNS server, go to Settings > Network > Set Up Internet Connection > Custom and change the DNS settings.

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