There’s (at least) two friends with who I have a very hard time joining a game. Whenever I invite them or they invite me, the recipient of the invitation gets the error message “connection to host failed”. It works fine and every time with a third friend. One time he invited me and one of those two troublesome friends, we could both join the party, but only hear the voice of said third friend, but not of each other. Afterwards we managed to workaround by simply joining each other’s game in the PS4-friendslist, with no invitations sent. But as of today, that doesn’t seem to work anymore either.
For troubleshooting we tried forwarding increasingly more ports on the router, I even set everything up as a DMZ (NAT type 1), but to no use. Currently all the recommended ports are forwarded on all our ends, the PS4 connection tests show NAT type 2.
Other games (Destiny) work perfectly fine.
Any idea what we could try? Any help is appreciated, google doesn’t seem to deliver any useful results…