I was trying to log into the Syndicate server last night, and after getting a few server timeout errors, I got a Server Authentication Failed message. What does that mean? Bliss, if you read this, any ideas?
I was able to log into a another server without problems.
I think this happens (pure speculation) when the server thinks you are still on it. Such as your plane still thinking you are alive and in it. It seems restarting it fixes it. My only suggestion, before you leave the server, comes from the movie Pearl Harbor - If you are going to go out, make sure to dive your plane into the juiciest enemy target there is - That way at least you are dead and your plane is exploded

If it happens again, just post on our forums / hop on vent and let someone know and it will get restarted.