In this tutorial you will learn how to open port 80 on Redhat 7. By default, port 80 for the http connection is filtered on Redhat 7. You can only access this port from the actual localhost and not from any other public host. To open port 80 on RHEL 7 Linux we need to add an iptables rule. For this RHEL7 uses firewall-cmd.
First add your port 80 rule with a following command:
[root@bip1987 ~]# firewall-cmd --zone=public ...
By tapish01, September 16, 2015