Linux Open Port 80 (HTTP Web Server Port)

am new CentOS/RHEL 5.x/6.x user. How do I open port 80 (Apache Web Server) under Red Hat / CentOS / Fedora Linux? Tutorial details Dif...

CentOS / Redhat Iptables Firewall Configuration Tutorial

H ow do I configure a host-based firewall called Netfilter (iptables) under CentOS / RHEL / Fedora / Redhat Enterprise Linux? Netfilter is...