Pf Configuration Incompatible With Pf Program Version Jun 2026

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Do you have a that's causing the fuss? PF not loading rules | The FreeBSD Forums

: In OpenBSD 4.7, the syntax for NAT (Network Address Translation) and redirection changed significantly. Older "NAT-on" rules were replaced by a more unified syntax within the filtering rules themselves. OS Divergence pf configuration incompatible with pf program version

: Run the following command in your terminal to see exactly which line is causing the incompatibility: sudo pfctl -vnf /etc/pf.conf flag performs a "no-load" dry run, while provides verbose output to pinpoint the error. Update the Configuration File

: Ensure you are using the system-native pfctl (usually located at /sbin/pfctl ) rather than a version in /usr/local/bin/ . This public link is valid for 7 days

This error tells you that the version of the kernel module (the "program version") and the user-land tools (the "configuration") are no longer speaking the same language, making communication impossible. This is a hard failure designed to prevent system instability or crashes that could arise from an incompatible setup.

After a freebsd-update or a kernel source recompilation, the new kernel includes an updated pf.ko module. However, the old pfctl binary remains loaded in memory or on disk from the previous version. A reboot is often required to synchronize both. Can’t copy the link right now

If your configuration uses nested anchors or references dynamic tables, ensure your version supports inline table generation. Older versions will throw a version compatibility error if tables are defined inside anchor files implicitly. Resolution Workflow

On rare occasions, a stale pf kernel module remains loaded after a partial update, while the boot-time scripts load a different userland version.

: 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.