Iptables Example

This is an example on how to allow some traffic input to CentOS server.

At first you already install apache, mod_ssl and mysql, but you still cannot access apache or mysql.
There is a possibility that you have not set up your firewall.

Open iptables configuration using your favorite editor.

/etc/sysconfig/iptables

Add 3 rule input to allow traffic for http, https and mysql.

-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

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

-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

Don't forget to restart iptables

#service iptables restart

You could check your current iptables configuration with:

#iptables -L