I'm getting this error too. Tried all the little tips and things to solve it; removing files, changing DNS server, doing clean install.. Even tried to download it from Steam but that gives me "unauthorized Certificate Error" too so didn't bother too much with that. This game have worked without any problems ever since I started to play it but now I'm getting this error. Don't know what to do. Maybe I will just cancel my subscription until I can actually log in and play.