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: This guide is written for system administrators managing BSD firewalls in production environments. For further assistance, consult the FreeBSD Handbook's PF section or the official pf(4) and pfctl(8) manual pages.

Here is a breakdown of why this happens and how to resolve it.

typically occurs on macOS or BSD-based systems when there is a mismatch between the Packet Filter (pf) configuration file rules and the version of the utility or the system kernel.

A: Yes, if you use the pf kernel module on Linux (e.g., via Gentoo or pfSense's underlying FreeBSD heritage). The same principle applies.