Configuration Incompatible With Pf Program Version - Pf

To verify your version and see which syntax your specific system expects, always check the local manual page using man pf.conf rather than online tutorials, which often default to the latest OpenBSD "Current" syntax.

sysupgrade # on OpenBSD -current reboot

The error message "pf configuration incompatible with pf program version" pf configuration incompatible with pf program version

A new version of PF may have removed a feature that existed in previous versions.

By ensuring that your kernel version matches your userland utility version and validating your syntax against the updated documentation of your specific OS deployment, you can permanently eliminate this version mismatch error. To help tailor these steps, let me know: To verify your version and see which syntax

To avoid encountering the "pf configuration incompatible with pf program version" error in the future:

Modern PF is stateful by default. The keep state keyword is redundant and, in some specific contexts or strict parsers, may cause confusion if mixed with newer state options like modulate state or synproxy state . To help tailor these steps, let me know:

If pfctl -V shows a newer version than the kernel expects, the config syntax may have changed.

Understanding why this happens is the first step toward a stable network configuration. Usually, this occurs after a system upgrade where the userland utilities (the pfctl command) have been updated, but the kernel hasn't been rebooted to load the matching PF module. Conversely, it can happen if you are manually compiling a newer version of the PF tools while running an older kernel. Because PF relies on specific data structures to pass information between the command line and the kernel, even a tiny change in the code can break the communication bridge, leading to this compatibility error.