Apache requests were being blocked on the firewall. The following commands were run to allow all requests through the firewall;
firewall-cmd --zone=public --add-port=80firewall.
firewall-cmd --reload
firewall-cmd --zone=public --add-port=80/tcp
firewall-cmd --reload
It should also be possible to use the following command instead of allowing port 80;
firewall-cmd --add-service=http
firewall-cmd --reload
firewall-cmd --add-service=http
firewall-cmd --reload