I am new CentOS/RHEL 5.x/6.x user. How do I open port 80 (Apache Web Server) under Red Hat / CentOS / Fedora Linux?
I have Red Hat Enterprise Linux 5 server with Iptabeles firewall enabled. I have started all services but don’t know how to open port using iptables. By default it is only allowing port ssh tcp port # 22. How do I open port 80 / 143 / 110 on Linux?