Are you a bit paranoid or security conscious? Perhaps you want to be able to track down when someone is trying to break into your Mac. OS X has a decent firewall, but tracking down what it's blocking can be a bit of a chore. Logging isn't on by default, so you have to do this manually. Here is how to do it: Open 'System Preferences' next, choose 'Sharing' now, click on the 'Firewall' tab (make sure the firewall is 'ON' , and then click on 'Advanced' Now, add a check mark next to 'Enable Firewall Logging'. Now, your firewall will add to the log when it blocks. To view the log, simply click on 'Open Log'. To view the log manually, from the Finder, choose GO->Utilities Open 'CONSOLE', then click on 'LOGS' Then in the lefthand pane, drill down until you can expand the' /var/log' area After it is expanded, click on 'ipfw.log' The file may be empty, especially if you just recently enabled logging.