ciao, ho fatto come mi hai indicato:

paolo@paolo-desktop:~$ sudo iptables -L
Password:
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination
paolo@paolo-desktop:~$ sudo /etc/init.d/iptables stop
sudo: /etc/init.d/iptables: command not found
paolo@paolo-desktop:~$ iptables stop
Bad argument `stop'
Try `iptables -h' or 'iptables --help' for more information.
paolo@paolo-desktop:~$
Come puoi vedere il comando "iptables stop" non funziona!

Non so che fare, HELP!!