If your Linux server is behind a hardware firewall, and you are on a trusted network, you may feel that it is OK to turn off your software-based firewall. This isn't always a good idea, but if you are sure, here's how to do it in Fedora Core:

Switch to the root user with su (or run the following commands with sudo)

/sbin/chkconfig iptables off
/sbin/service iptables stop

The first command stops the Fedora Core firewall, iptables, from starting up on a system restart. The second command tells iptables to turn off right now.