Kind of disheartening that no was has replied to this. It also looks like I'm not the only one unable to post a new thread in the forums...
Just bought Arma 3 last night and I've been unable to play. If I can join a server, I select a side and it kicks me back to the server browser. That is if I can even join a server, most of the time my ping is too high to join any or battleye kicks me with ping too high. It's funny that out of the 50+ games I've played, this has never been an issue. My connection is not an issue. I played Arma 2 fine on this same connection. I can't find one server below 250ms, but any server with actual people in them are 500+ pings. So pretty much this has been a waste. I might have to see if Steam will refund me, I'm not happy at all.
I did try some port forwarding that i've googled, firewall disabled, re-verified integrity of files.