I got this error when I started playing recently and made an exception in my firewall (ESET Smart Security 8). The game has been running fine since then (over a week) and after today’s patch it won’t run unless I disable the firewall. This isn’t right. If I make an exception in my firewall this should be enough, I shouldn’t have to completely disable the firewall in order to get into a game. This is apparently an issue that has been around for a while as I’ve found many people with the same issue. I’ve tried verifying the game integrity with steam and it said it fixed 2 bad files but I still have the same issue.
I saw the General Technical Support thread mentioned something about SSL filtering from BitDefender. ESET Smart Security 8 also has this but I always have this feature disabled.
Here’s the log of what the firewall is doing when the game launches (this is from running the game ONE time): http://i.imgur.com/Txfr6Px.png
EDIT: About an hour after I tried running the game it’s suddenly working again. I completely forgot the possibility of a bad hop from me to the server. I recall getting disconnected from only DirtyBomb lastnight. Maybe it was this, but now I can’t check since it’s working fine.
EDIT 2: See third post for solution.
EDIT 3: Game still broken. It was working for about half a week.