Clear all rules from iptables without locking me out of the server

clear-iptables.sh

#!/bin/sh

# Clear out all iptables rules and make the changes persistent.

# first, find out if we're sudo
if [ $(id -u) -ne 0 ]; then
  echo "Nope. Simon didn't say so.";
  exit 1;
fi

iptables -L
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t nat -F
iptables -t mangle -F
iptables -F
iptables -X
/etc/init.d/iptables-persistent save
iptables -L