The socketfilter Firewall is what is used when the Firewall is turned on in the Security and Privacy Preference Pane. In order to appropriately monitor what access is allowed and denied, logging must be enabled.The logging level must be set to "detailed" to be useful in monitoring connection attempts that the firewall detects. Throttled login is not sufficient for examining Firewall connection attempts.In-depth log monitoring on macOS may require changes to the "Enable-Private-Data" key in SystemLogging.System to ensure more complete logging.