linux open port HowTo - Linux / Unix Q & A from nixCraft

OpenSuse / Suse Linux Open a Port Range in the Firewall

in Iptables, Linux, Security, Suse last updated June 2, 2009

How do I open a network port range in the firewall under OpenSuse / Suse Enterprise Linux server? How do open a port range in my firewall, such as the TCP ports 30000 to 35000?

Redhat / CentOS / Fedora Linux Open TCP/UDP Ports

in CentOS, Iptables, Linux, RedHat and Friends last updated January 5, 2018

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?