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Allow apache service through firewall but only for the dmz zone. Make sure it's persistent.
firewall-cmd --add-service=http --zone=dmz firewall-cmd --reload
firewall-cmd --add-service=http -- permanent firewall-cmd --reload
firewall-cmd --add-service=http --zone=dmz --permanent firewall-cmd --reload
A client's IP address is in the DMZ zone. You have to allow http request to DMZ zone so that your client can access HTTP or Apache service on your server. You can use the zone option from firewall-cmd to specify specific zone. Example screenshot - http://prntscr.com/ge9aol
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