https://www.freebsd.org/doc/handbook/firewalls-ipfw.html says after setting up rc.conf to run "service ipfw start". This will get you locked out as it doesn't use the firewall_type from rc.conf - that has to be passed as an argument to the command, e.g. "service ipfw start open". As documented, only the default deny rule is applied and you'd better have console access...
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