Use the to roll back to a known working configuration.
If this error appears on a firewall appliance after a firmware upgrade: Navigate to . pf configuration incompatible with pf program version
This guide explores why this error happens and how to fix it to restore your firewall's functionality. Understanding the Version Mismatch The PF firewall operates in two parts: Use the to roll back to a known working configuration
The actual engine that inspects and filters packets at the system's core. Understanding the Version Mismatch The PF firewall operates
If you are on a development system, you may need to recompile pfctl against your current kernel headers:
The -n flag performs a "no-load" dry run, while -v provides verbose output. If this command returns a specific line number, the "incompatibility" might just be a deprecated keyword in your ruleset. 2. Synchronize Kernel and Userland
When you see this error, it means is trying to communicate with a kernel version of PF that it does not recognize or support. This most commonly happens after a partial system update where the operating system's kernel was updated, but the userland tools were not (or vice-versa). Common Causes