On Friday 11 July 2014 at 13:33:26, freefall12 wrote: > babajaga wrote > > > It is not their listening port ? I doubt it, how else could you use it ? > > i check the port using telnet and it is closed. i guess they employ > iptables to redirect a certain range of ports to a single port. It sounds to me like a technique known as "port knocking". http://en.wikipedia.org/wiki/Port_knocking http://www.portknocking.org/ Regards, Antony. -- Abandon hope, all ye who enter here. You'll feel much better about things once you do. Please reply to the list; please *don't* CC me.