Plutonium

My friend and I weren't able to connect to each other in zombies private matches until yesterday. Didn't do any port forwarding, it just randomly started to work. You might just be unlucky and maybe it will start to stabilize over the next day or 2

A friend and I have been trying to get a zombies game going for the last couple days but have been getting errors whenever the invite is accepted, no matter who hosts. I saw a couple posts on here yesterday saying that the issue was fixed that same day but we still haven't had any luck. Is this a known issue or is this just on our end?