yeah, when it doesn't show up in the server tracker it won't show up in steam either, nor in the in game server browser. Direct connect will still work then though (provided it's running the correct version of course)
I can see it's running now eventhough servertracker says it is not
EDIT: actually, I gave it a restart which would usually make it visible, but it doesn't and direct connect doesn't work either. I think you might have to do a complete reinstall or something Duke, or put in a ticket at the server rental...