Pf Configuration Incompatible With Pf Program Version May 2026

“pf configuration incompatible with pf program version”

Summary

Detect and surface a clear, actionable diagnostic when a pf (packet filter) configuration file’s syntax or features are incompatible with the installed pf program version. Prevent failed loads, reduce troubleshooting time, and guide users to resolution steps.

5) Step-by-step recovery procedure (prescriptive)

  1. As root, test config:

    • pfctl -nf /etc/pf.conf
    • If errors, edit config to fix syntax errors reported; then re-test.

  2. Stop packet filtering and clear state:

    • pfctl -d
    • pfctl -F all

  3. Reload rules:

    • pfctl -f /etc/pf.conf
    • pfctl -e (enable if disabled)

  4. If error persists, reboot system.

  5. If still persists, ensure kernel/userland match:

    • Update system fully per OS docs, then reboot.

  6. If you maintain a custom kernel/module:

    • Rebuild the pf kernel module (or full kernel) against your current sources and reinstall.

  7. If you need to revert:

    • Restore earlier working /etc/pf.conf from backup.
    • Restore previous OS snapshot or reinstall matching packages/kernel.

8) When to seek help

Provide these when asking for help on forums or with vendor support:

macOS

Solution A: Use the System’s Native pfctl macOS ships with its own PF version. Avoid installing a separate pfctl via Homebrew. Check which you are using:

which pfctl

If it points to /usr/local/bin/pfctl, rename or remove it, and use the system one at /sbin/pfctl.

Solution B: After macOS Upgrade, Reboot A major macOS upgrade (e.g., Monterey to Ventura) changes the kernel. Always reboot after such updates. Then: pf configuration incompatible with pf program version

sudo pfctl -f /etc/pf.conf
sudo pfctl -e

Solution C: Disable SIP Temporarily (Not Recommended) In rare cases, mismatched PF binaries persist due to System Integrity Protection. Boot into Recovery, disable SIP, remove conflicting PF tools, then re-enable SIP. This is a last resort.

Step 1: Check Your OS Version and Patch Level

Run the following command:

freebsd-version -kru | uniq

Or for OpenBSD:

sysctl kern.version

You are looking for discrepancies between the -k (kernel) and -u (userland). If they differ, you have found the culprit. “pf configuration incompatible with pf program version”

What This Error Is NOT

It is important to distinguish this error from other common pf issues:

| Error | Meaning | |-------|---------| | pfctl: /etc/pf.conf: syntax error | Your rule syntax is wrong, not a version mismatch. | | pfctl: ioctl (DIOCXCOMMIT): Device busy | Ruleset is already loaded or another process holds pf. | | No ALTQ support in kernel | Kernel missing options ALTQ; unrelated to pf version. |