Wired Connection, get this error playing Ghost of Tsushima : r/playstation
All PS4 Error Codes [SOLVED] - eXputer.com
HELP] friends list not showing up/cannot load (NW-31456-9) : r/PS4
✔️ HOW TO FIX CANNOT CONNECT TO SERVER & DNS ERROR ON PS4 (NW-31456-9 & NW-31520-1) *WORKING 2020* - YouTube
How To Fix PS4 Error NW-31456-9 & NW-31205 - Fix PS4 DNS Settings Error (Simple Method) - YouTube
Ask PlayStation on Twitter: "@Mahdiyar09 In that case please check the following link: https://t.co/cUXuBEew8d and choose "I can't sign in to PSN" for troubleshooting steps on this matter." / Twitter
How to Fix PS4 Error Code NW-31456-9 | Cannot Connect to the Server Within the Time Limit PS4 - YouTube