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After unistalling and re-installing the firewall I get

Apr 04 11:43:06 server.curvagreek.com systemd[1]: Starting ConfigServer Firewall & Security - lfd...
Apr 04 11:43:06 server.curvagreek.com lfd[24147]: Can't use an undefined value as a symbol reference at /usr/sbin/lfd line 7074, line 717.
Apr 04 11:43:06 server.curvagreek.com systemd[1]: lfd.service: control process exited, code=exited status=25
Apr 04 11:43:06 server.curvagreek.com systemd[1]: Failed to start ConfigServer Firewall & Security - lfd.
Apr 04 11:43:06 server.curvagreek.com systemd[1]: Unit lfd.service entered failed state.
Apr 04 11:43:06 server.curvagreek.com systemd[1]: lfd.service failed.

I got the same issue after a new installation on a clean server.

After digging some logs I found the following line in /var/log/lfd.log After switching TESTING to enabled I was able to start lfd without any further issues.