Yes, that's exactly how port knocking works! Your have been told to only let people in who knocks 3 times -- I knocked only twice so you don't even reveal to me that you are home. After trying couple of times to knocking twice on your door I assume nobody home so I give it up and go to your neighbour to sell my hoover :-) Tamas ---------- Forwarded message ---------- From: Carey Fisher Date: May 3, 2007 11:56 PM Subject: I hear you (port) Knocking... To: "Microcontroller discussion list - Public." ...but, you can't come in... -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist