Ghost CMS + SELinux
Easy way to deal with SELinux blocking Your ghost blog port (or other app).
Check on what port Your app is listening: netstat -tulpn
Check what http ports are allowed by SElinux: semanage port -l | grep http
Add Your port to SELinux: semanage port -a -t http_port_t -p tcp 123
Of course, if that port is closed on firewalld, no one will get access to it from outside.
That is it ;).