I have enabled the built-in firewall on my MacBook (Sierra v10.12.1), but unfortunately the log files located in /var/log (appfirewall.log and alf.log) stay empty. I contacted Apple Support but they don't know the reason or a solution to this problem. I saw someone with a similar problem and concerns at: Firewall logging enabled, but not recording which isn't resolved.

Any ideas how to handle this one?

  • 1
    Please add your system version by editing your question and adding the proper tag. – klanomath Aug 8 '17 at 16:49
  • I'm seeing the same issue in 10.13.4 (High Sierra) – Jonathan Cross May 19 '18 at 8:31
  • Same in macOS Mojave 10.14.2. – Ortomala Lokni Dec 16 '18 at 20:20

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