Pf Configuration Incompatible With Pf Program Version Jun 2026

Before making changes, use the pfctl tool to check exactly where the incompatibility lies without actually applying the rules. Netgate Forum Restoring pfSense configuration to different hardware

: Write a script that compares kernel version with pfctl -V output and alerts if they differ.

Navigate to the pfctl source directory (usually /usr/src/sbin/pfctl ). Run make clean && make && make install .

If the output shows a mismatch (for example, the kernel is running 13.1-RELEASE but the userland is at 13.2-RELEASE ), your system upgrade did not complete successfully. pf configuration incompatible with pf program version

Reboot your system if you recently updated the OS to ensure the active kernel matches the disk binaries.

This error indicates a fundamental disconnect: the syntax or binary format of the ruleset you are trying to load does not match the logic expected by the version of the Packet Filter (pf) software currently running on the kernel.

While OpenBSD, FreeBSD, and macOS all use PF, their implementations have diverged significantly over the years. Copying a pf.conf file directly from a FreeBSD server to a macOS machine without modifying the syntax frequently triggers version incompatibility errors. Step-by-Step Diagnostic Process Before making changes, use the pfctl tool to

: 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

: Always reboot after a major version upgrade to load the new kernel and modules.

If you have multiple versions of pfctl installed (perhaps one in /sbin/ and another from a package in /usr/local/sbin/ ), ensure you are calling the one that matches your current kernel version. Diagnostic Command Run make clean && make && make install

: The recommended approach is to follow the source upgrade process to its conclusion.

: This is faster than rebuilding the entire userland and often resolves the issue.

If you have rebooted into a new kernel but the userland utilities (including pfctl ) are still built for an older version:

Which and version are you currently running?