Just installed FreePBX 14 on a Asterisk 18 Contos machine.
When I try to access the webpage it just redirect to servername/admin/config.php and I get a HTTP 500 Error.
Followed this guide here: computingforgeeks (.) com / how-to-install-freepbx-on-rhel-centos-8
If you’re a newbie, then I strongly recommend you not follow a random tutorial using an aging version of FreePBX and instead install with the FreePBX Distro. https://www.freepbx.org/downloads/