Logging MacBook firewall is empty
To get some logging from the Firewall you have to define some rules.

Open System Preferences &gt; Security &amp; Privacy &gt; Firewall, unlock it, and select
Firewall Options and add some rules about application you want to block any access from the outside.

Ex. :


Once done, lock back the Security &amp; Privacy preference menu.

Try any prohibited or allowed access and you will see it appear in /var/log/appfirewall.log.