We are working on an application that requires remote access to MariaDB (asterisk DB). Upon review that the VitalPBX GUI does not appear to allow you to specify a custom TCP or UDP port and application, I created the rule manually using firewalld and verified by issuing the command: cat /etc/firewalld/zones/public.xml
However. As a test, upon reloading the firewall in the GUI, all of my changes are overwritten. How do we make our own changes persistent to accommodate special application situations?