Im having this same issue and cant seem to fix it, but this might help a little bit. ok, so the first thing to understand is that there are tones of fixes for this, meaning, that arma might not be the problem. the problem might have to do with your router, your firewall, or some third party program that conflicts with your connection; skype, for example. heres is few things you can try if you havn't already, none work for me, but i have heard some reports of success. -update your routers firmware; i did this and it allowed me to join one server before i had the error message again. -switch your encapsulation mode from within your router settings to LLC (this only works for some routers, look it up online if you don't know). -manually update the battleye client (youy probobly aready tried this, but ill put it out there anyway). -if none of these helps then you're in the same boat as i am. my advice?, stop wasteing your time, i messed with this for several weeks only to find nothing, wait til the stand alone. -one more thing that you may not know, this error might be battleye thinking that you're a hacker. it means that battleye has labeled your I.P. as a bad thing, and you will not be able to join unless you switch your I.P. which is very difficult and may cost you money. this is undoubtedly what has happened to alot of us. honestly battleye is a bad thing. i don't like it at all. i hoped this helped and if it didn't, well...your stuck waiting with me til the stand alone.