Okay I have this bug and from what i've seen it appears to be quite common and I can't join any server whatsoever. 
I have a Netgear router, and people say that tends to be the problem with the DGN1000 or something, personally I have no idea what that means along with multiplexing.  
-I have reinstalled BattlEye 
-I have reinstalled Arma 2, Arma 2:OA, and all of the DLC 
Since this is fairly common, why has it not been fixed after 3 years of the games actual release? 
I want instructions on how to fix this or my money back