I woud more belive that port scanning is not walking into posesion somebody and checking doors and windows, I will say is like someone walking on the street and is looking on ya house, the sam way he/she can see where u have windows and doors, how many of them, what kind of window frame, r they behind bars etc.. and all of this ppl can discover this just walking on the street on fron ya house, Can u stop them? siaraX