This maybe particularly useful for those who need to know how to block all ports in IPTABLES except 80 & 443 (Linux Firewall - Centos 5.5).

Type in:

sudo iptables -A INPUT -p tcp -i eth0 --dport 80 -j ACCEPT sudo iptables -A INPUT -p tcp -i eth0 --dport 443 -j ACCEPT service iptables save

Image:

Enjoy.