Pf Configuration Incompatible With Pf Program Version [patched] Jun 2026

pfctl -n -vvf /etc/pf.conf

If you are running a custom environment or a Linux variant utilizing a ported version of PF, the quickest fix is to force the PF kernel module to rebuild against your current kernel headers.

Load the correct module from /boot/kernel/ :

Then reload your ruleset.

What and version are you running? (e.g., FreeBSD 14, OpenBSD 7.5, macOS Sonoma)

The output will show the exact line number and the specific rule causing the error. 2. Check Common Syntax Conflicts

: 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. pf configuration incompatible with pf program version

To resolve version incompatibility, a configuration migration strategy is required.

Sometimes the error appears even after updates because an old binary file persists.

The "pf configuration incompatible with pf program version" error is a classic symptom of a fractured system where the firewall kernel module and the management tools have drifted apart. While alarming, it is straightforward to diagnose and resolve. pfctl -n -vvf /etc/pf

Check the version of your running kernel against the version of your user-space environment. uname -aK Use code with caution. Check user-land version (on FreeBSD): freebsd-version -u Use code with caution.

macOS transitioned through various versions of PF (Packet Filter), which was originally ported from OpenBSD. When users upgrade macOS, they often find that custom rules they wrote years ago use syntax (like certain NAT or ALTQ commands) that the newer "chef" has deprecated or removed.