Please try what Arkiashi suggested
>Try these steps in order:
Check if PlayStation Network is working normally. If PSN services are having issues, online games can fail to connect.
Restart everything:
Turn off the PS4 completely (not Rest Mode).
Unplug your modem/router for 2–5 minutes.
Turn the router back on, wait until it’s fully connected, then start the PS4.
Test another network. If possible, connect your PS4 to a mobile hotspot. If DayZ works there, the issue is with your home network or ISP.
Change your DNS on the PS4:
Primary: 1.1.1.1
Secondary: 1.0.0.1 Or try:
Primary: 8.8.8.8
Secondary: 8.8.4.4
Rebuild the PS4 database (Safe Mode → Rebuild Database). This won’t delete your games or saves.
If none of the above works, delete and reinstall DayZ. Corrupted game data can sometimes cause connection failures.