Pf Configuration Incompatible With Pf Program Version [portable] – Verified

The Packet Filter (PF) firewall is a core security component in BSD-based operating systems, including FreeBSD, OpenBSD, NetBSD, and macOS. When managing or upgrading these systems, administrators frequently encounter the following error message during boot or when applying firewall rules:

Understanding and Fixing "pf configuration incompatible with pf program version"

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.

If you just ran freebsd-update install or built a new world/kernel: pf configuration incompatible with pf program version

If this command succeeds without errors, your syntax is technically correct for your current pfctl binary, strongly confirming a userland-to-kernel version mismatch. 2. Verify Kernel and Userland Versions

ls -l /sbin/pfctl

Check if your system binaries match your running kernel. Run the following commands to compare versions: The Packet Filter (PF) firewall is a core

pfctl -V

pfctl: pf configuration incompatible with pf program version

man -s 5 pf.conf # on the target system

Fix "PF Configuration Incompatible with PF Program Version" Error

The "pf configuration incompatible with pf program version" error can have significant implications on network security and functionality:

Never run pfctl -f /etc/pf.conf blindly on a remote production server. Always run pfctl -nf /etc/pf.conf first. If it returns any errors, do not attempt to reload the firewall. Always run pfctl -nf /etc/pf

There are several reasons why PF configurations may become incompatible with PF program versions:

If you are migrating from pfSense to OPNsense (or vice versa),