Pf Configuration Incompatible With Pf Program Version (2026 Update)

If you recently upgraded the kernel without updating userland, perform a complete upgrade.

The kernel/userland API for PF can change subtly between releases. When an old pfctl binary attempts to load a ruleset into a new kernel with updated data structures, the kernel rejects the ioctl commands, returning the incompatibility error.

No. This error indicates a mismatch between the userland utilities and the kernel module, not a syntax error in the configuration file itself. However, it is a good practice to check your ruleset for syntax errors using pfctl -nf anyway. pf configuration incompatible with pf program version

Next, flush all existing rules, tables, states, and counters from the kernel memory: sudo pfctl -F all Use code with caution.

binary may be using a different version of the application interface (API) than the running kernel. This often happens if you update your base system but do not reboot, leaving an old kernel running with new binaries. Deprecated or New Syntax /etc/pf.conf might use syntax from a different version (e.g., using If you recently upgraded the kernel without updating

/System/Library/AssetsV2/com_apple_MobileAsset_MacSoftwareUpdate/ via Safe Mode. Complete the Upgrade

Run a dummy ruleset parse to see if pfctl fails purely on syntax or on structural execution. pfctl -nf /etc/pf.conf Use code with caution. Next, flush all existing rules, tables, states, and

Using an old pf.conf file containing syntax that has been completely deprecated and removed from newer versions of the PF engine. Step-by-Step Troubleshooting Guide

Validate config syntax (no load):

In early versions of PF (pre-OpenBSD 4.1), statefulness was not the default. Administrators were required to explicitly define state tracking.