I believe I accidentally made it auto shut down on Windows when it was only supposed to be doing so on Linux. But as far as I'm concerned, the server should remain up as long as you're actively playing the game. Or is it shutting down instantly for you?
I really should give a review already: This is the best game I've seen in this category. There's a story, it's not super cheesy, and I like both the main two girls as well as the cafe. Other games have something broken about them or some such that I can't turn off certain things that don't interest me. You and the team thought of everything, so I feel at peace playing Project Reality. Can't wait to see what the update brings!