When I am going to be away from my computer, I lock the screen by clicking my name in the top right corner, and selecting 'Login Window'. I've noticed that when I do this while I am online wirelessly, I will have no connectivity when the screen is locked. However, when I am connected with my ethernet cord, locking the screen does not affect connectivity at all.
Is there a setting to allow Airport to be on even when the screen is locked, or is this unavoidable?