I just came across this thread, but were having similar issues. When we were running a beta server we had no issues.
Now since the update and going to stable. For every 10 players that join 9 get steam ticket checks and are kicked.
Were not running VON its disabled, were using a Teamspeak on a separate server. No mods. Stable version.
For those who've been running larger(32+ Player) dedicated Linux servers. What's your performance like compared to a Windows Server and the normal method?
I'd really like to ditch the Windows Server for a Linux one and save the $25 a month that's usually charged as an extra for a Copy of 08R2.