Before troubleshooting, it is essential to understand what PF is. Packet Filter (PF) is the native firewall and network address translation (NAT) system found in , OpenBSD , NetBSD , and DragonFly BSD . It is also available (though less commonly) on some Linux distributions via pf-kernel .
If the mismatch is caused by your package manager, try rebuilding the database to ensure matches your kernel version. pkg update -f pf configuration incompatible with pf program version
pfctl -V
sysctl kern.version
Tools like Murus Firewall or Little Snitch might generate a modern config file that the system's default, older pfctl program cannot parse. Before troubleshooting, it is essential to understand what
pfctl -V pfctl version OpenBSD 7.0