Login as root
cp /etc/sysconfig/iptables /etc/sysconfig/iptables-ori01
nano /etc/sysconfig/iptables
Search for words "COMMIT"
Before COMMIT enter below:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport PORTNUMBER -j ACCEPT
Change the PORTNUMBER to the portnumber you want to allowed to access the server.
