Please put this following code in iptables script:

:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT – [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp –icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp –dport 5353 -d 224.0.0.251 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 631 -j ACCEPT

-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp -s 3.16.1.93 –sport 53 -d 0/0 -j ACCEPT

-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 7968 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 50000:59999 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 20000:20999 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 30000:30999 -j ACCEPT

-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 5060 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 5061 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 1720 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 1719 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 1718 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 5060 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 5061 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 8000:20000 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 50000:59999 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 20000:20999 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 30000:30999 -j ACCEPT

-A RH-Firewall-1-INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT
## ftp
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT –reject-with icmp-host-prohibited
COMMIT