Before upgrading, read the OpenBSD or FreeBSD release notes. They always document changes to pf.conf .
If you encounter this error inside a FreeBSD jail, the jail's userland binaries (including pfctl ) are likely newer or older than the host system's kernel.
This error tells you that the version of the kernel module (the "program version") and the user-land tools (the "configuration") are no longer speaking the same language, making communication impossible. This is a hard failure designed to prevent system instability or crashes that could arise from an incompatible setup. pf configuration incompatible with pf program version
What and version are you running? (e.g., FreeBSD 14, OpenBSD 7.5, macOS Sonoma)
Always save a copy of your working pf.conf before making major system changes. Before upgrading, read the OpenBSD or FreeBSD release notes
Understanding the root cause is essential for a permanent fix. 1. System Upgrade Without Rules Update
On FreeBSD:
The pf configuration incompatible with pf program version error is rarely a broken config file; it is usually a cry for help from an out-of-sync system. Aligning your userland utilities with your running kernel version via a clean reboot or system update will resolve the conflict in most scenarios.
: The -current branch is for development. If you need stability, run the latest release branch ( -release ) and only apply security patches via the official errata. This error tells you that the version of
Ensure that your scripts and system startup configuration point to the official system binary located in /sbin/pfctl . Step 4: Clear the Current PF State (Emergency Recovery)
This occurs when you restore a configuration file from one operating system onto another.