Trying to play with a friend; he shows up on PSN, and on my list in game, but when he replies to an invite he gets “connection failed” though he is online. I don’t show up on his list in game at all.
UPDATE: After he did some port forwarding and reset his router to factory settings we got online and had a flawless few hours co-op. BUT - when he closed down for a couple of hours and booted back up, the problem was back!
LATEST (Sun 5 April) in his words:
This is more of a workaround than a fix.
The steps. Shambolic though they are.
Tried reinstalling the game and rebuilding database. No success.
Tried Power Cycling my modem and router. Turn off both. Boot up modem then router when modem fully booted. No success.
Whilst in game at main menu went to Network in Ps4 settings and ran Setup Internet Connection. SUCCESS.
Would have to repeat Setup Internet Connection each time I restarted the Game after shutting down the Ps4. But might have to run the Setup few times before it would connect. Sometimes it would work at Main Menu sometimes in a Map in game.
Game would go back Offline when saving and quitting to Main Menu.
This morning. Nothing was happening again.
Rebuilt database. No Success.
Power Cycled modem and router. No success.
Repeatedly ran Ps4 Setup Internet Connection, at Main Menu and in Game, until SUCCESS it connected again.