Pf Configuration Incompatible With Pf Program Version

(less direct; often you must check the kernel build date.)

On FreeBSD, PF is a loadable kernel module ( pf.ko ). If you build a new kernel (or install a new release) but still have an older pf.ko file in /boot/kernel/ , the mismatch will occur. This can happen if you forget to run make installkernel or if the module path is incorrect.

A) Partial OS upgrade (userland vs kernel mismatch)

Provide a to restore basic connectivity. pf configuration incompatible with pf program version

: ~80% for standard FreeBSD upgrades.

: You might have upgraded the user-land tools (like pfctl ) without rebooting to the new kernel, or vice-versa.

pfctl -f /etc/pf.conf

In systems like OpenBSD or FreeBSD, updating only parts of the base system can lead to versioning conflicts between the binary and the kernel interface it expects.

Fixing the "PF Configuration Incompatible with PF Program Version" Error

Then create /etc/pf.conf.6.9 , /etc/pf.conf.7.0 , etc. (less direct; often you must check the kernel build date

Ignoring this error will result in a failed firewall start, a non-functional ruleset, and potentially an exposed network. This article dissects the root causes, provides step-by-step diagnostics, and offers multiple resolution strategies to restore harmony between your pf components.

Modify /etc/pf.conf to align with your current version. If you are on an older version, remove or modify newer features. If you are on a newer version, replace deprecated syntax with the new equivalent. Step 5: Reload the Rules Once you have modified the configuration, test and load it: pfctl -f /etc/pf.conf Use code with caution. Preventing the Error: Best Practices

If you accidentally installed sysutils/pf or security/pf from ports, it may have placed a newer pfctl in /usr/local/sbin . To resolve: A) Partial OS upgrade (userland vs kernel mismatch)

If you'd like to dive deeper into the technical side, let me know: What (macOS, FreeBSD, etc.) are you on? Did this happen after an update or a new installation ?

sysctl kern.version OpenBSD 6.9 (GENERIC) #1