hey man , i had it to , all i did was right click arma 3 in steam library , propterties , betas , then update it to develop beta and then update it back to the normal one ... that fixed it for me , hope it helps
So the message that says ''connection failed'' is not up to me, and that doesent come up because my game, its up to server? i just wanna know, so i can rest my case and wait for the update to log in again.