Enabling and Disabling the Firewall

• Disable firewall — Disabling the firewall provides complete access to your system and does no security checking. Security checking is the disabling of access to certain services. This should only be selected if you are running on a trusted network (not the Internet) or plan to do more firewall configuration later.
  	Warning
  	If you have a firewall configured or any customized firewall rules in the /etc/sysconfig/iptables file, the file is deleted by selecting Disable firewall and clicking OK to save the changes.

• Enable firewall — This option configures the system to reject incoming connections that are not in response to outbound requests, such as DNS replies or DHCP requests. If access to services running on this machine is needed, you can choose to allow specific services through the firewall.