Pf Configuration Incompatible With — Pf Program Version Fix

Once resolved, take these preventative measures:

freebsd-version -kru | uniq

: Test your configuration file for errors without loading it by running: sudo pfctl -nf /etc/pf.conf

If you have manually compiled third-party utilities or have duplicate pfctl binaries located in /usr/local/sbin/ versus the system default /sbin/pfctl , your shell might be invoking the wrong version. Verify which binary is executing by running: which pfctl Use code with caution. pf configuration incompatible with pf program version

The error is a protective mechanism, not a bug. It prevents you from loading a ruleset that the kernel would misinterpret, which could lead to unpredictable filtering behavior or system panics.

Before upgrading, read the OpenBSD or FreeBSD release notes. They always document changes to pf.conf .

OpenBSD ties PF tightly to the specific release version. If you are attempting to use a snapshot kernel with a release userland, PF will fail. Ensure you run sysmerge after upgrades to resolve any configuration file discrepancies and ensure your binaries match your current kernel tier. Step 4: Rule Out Configuration Syntax Drift It prevents you from loading a ruleset that

Upgrading your OS (e.g., from FreeBSD 13 to 14) updates the pfctl binary, but your active kernel might still be running the older version if the system hasn't rebooted cleanly.

When you see this error, it means is trying to communicate with a kernel version of PF that it does not recognize or support. This most commonly happens after a partial system update where the operating system's kernel was updated, but the userland tools were not (or vice-versa). Common Causes

If you cannot upgrade the kernel (e.g., in a production environment), you might need to use an older pfctl that matches the kernel. OpenBSD ties PF tightly to the specific release version

Because the standard upgrade procedure for OpenBSD (build kernel, reboot, build userland) creates a window where kernel and userland are mismatched. During that window, the old userland binaries try to interact with the new kernel, and PF's API is particularly sensitive to such mismatches.

Run pfctl -nf /etc/pf.conf to ensure it isn't a simple syntax error.

The scrub directive, used for packet normalization, has undergone significant changes.

pfctl version: FreeBSD 14.0-RELEASE-p4

If it points to a local or third-party directory, try explicitly calling the absolute path of the system's default pfctl to see if the error persists: sudo /sbin/pfctl -f /etc/pf.conf Use code with caution.