Work with iptables rule

1) Save the current Firewall rules to some file. (In case something goes wrong we can quickly revert the settings.

# iptables-save > /tmp/iptables.bkup

2) Now edit the file /tmp/iptables and copy paste the below command for making the port public.

# iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT

3) The below command will write the new changes of iptables into the memory.
# iptables-restore < /tmp/iptables.bkup

4) The below command will make the firewall changes permanent. After reboot also the new changes will not be lost.
# /etc/init.d/iptables save

5) Alternatively we can issue the below commands for making the ports public through terminal and we can save the iptables rules.

# iptables -I INPUT -p tcp -m tcp --dport 443 -j ACCEPT

# iptables -I INPUT -p tcp -m tcp --dport 3306 -j ACCEPT