For example, you might expect that your web browser will initiate TCP 80 and TCP 443 connections for HTTP and HTTPS web requests. The newest version also offers a real-time dashboard of network communication that shows the types of communications your applications are making.Īlthough relatively few instances of malware exist in the wild for Mac OS X, as software becomes more and more complicated, it’s a good idea to understand how your computer talks to other systems. You can instruct Little Snitch to deny traffic per your preferences-for example, one time only or forever. Little Snitch warns you when an application tries to initiate an outbound connection to another network resource, then prompts you whether to allow the communication. However as the Mac continues to rise in popularity, I expect to see new products for the Mac as well as improvements in existing products, and Little Snitch is no exception. But the Mac didn’t have a wide selection of choices, ostensibly because host firewall vendors were more attracted to the overwhelming market share and attack target Windows offered. In the Windows world, similar programs include Check Point Software’s ZoneAlarm and Symantec's Norton Internet Security. After using it for just a few days you'll be surprised how much data it reveals that leaks from your Mac. If you have a Mac, it's worth installing an outbound-focused host-based firewall such as Little Snitch. Outbound firewalls generally serve two main purposes: They can detect Trojan malware programs, which surreptitiously initiate outbound connections to evil parent servers, and, more commonly, they help you keep tabs on the communications of your legitimate applications. By default, the Mac OS X firewall focuses only on inbound connections.
Little Snitch was designed to monitor a Mac's outbound network communication. I was preparing my new Apple MacBook Pro for travel to the notorious hacker conference, DEFCON, when I came across Little Snitch, a host-based firewall application from Objective Development Software.
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