This scripts completely clears the firewall, and changes all policies to ACCEPT so that the system is complete opened up.

Issue the following command:

sudo vi /sharewiz/firewall/firewall-reset.sh

…add the following content to the file:

/sharewiz/firewall/firewall-reset.sh

#!/bin/bash
#
# Resets all firewall rules
echo "Stopping firewall and allowing everyone..."
#
# Modify the following settings as required:
#
IPTABLES=/sbin/iptables
#
# Reset the default policies in the filter table.
#
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
$IPTABLES -P OUTPUT ACCEPT
#
# Reset the default policies in the nat table.
#
$IPTABLES -t nat -P PREROUTING ACCEPT
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
#
# Reset the default policies in the mangle table.
#
$IPTABLES -t mangle -P PREROUTING ACCEPT
$IPTABLES -t mangle -P POSTROUTING ACCEPT
$IPTABLES -t mangle -P INPUT ACCEPT
$IPTABLES -t mangle -P OUTPUT ACCEPT
$IPTABLES -t mangle -P FORWARD ACCEPT
#
# Flush all the rules in the filter, nat and mangle tables.
#
$IPTABLES -F
$IPTABLES -t nat -F
$IPTABLES -t mangle -F
#
# Erase all chains that are not default in filter, nat and mangle tables.
#
$IPTABLES -X
$IPTABLES -t nat -X
$IPTABLES -t mangle -X

Prevent being locked out with IP table changes.

Issue the following command:

sudo vi /etc/cron.d/firewall-reset-sharewiz

…add the following content to the file:

/etc/cron.d/firewall-reset-sharewiz

0,10,20,30,40,50 * * * * root /sharewiz/firewall/firewall-reset.sh

Issue the following command:

sudo chmod 755 /etc/cron.d/firewall-reset-sharewiz