How to fix a stubborn application firewall in OS X | MacIssues
You can never be too safe. Unlike the firewall settings in Windows, the built-in firewall for Mac OS X is not enabled by default.
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The steps to do so are quite simple and user-friendly, but the first question is this: do you need to enable the firewall on your Mac? In most situations, though, having the firewall enabled will offer more benefits than drawbacks. It only takes one system vulnerability or rogue app, exploitable through the Internet, for your machine to be remotely accessed by a hacker.
By enabling the firewall, you bring up the shields and protect your sensitive files and personal information from such a possibility. Regardless, enabling the firewall is a good measure to take just in case. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.
Setting Up a Firewall: Mac OS X 10.6.x and above
If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app. If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.
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Some apps check their own integrity when they are opened without using code signing. If the firewall recognizes such an app it doesn't sign it. Instead, it the "Allow or Deny" dialog appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.
UC San Diego does not officially recommend any exceptions. University programs will not be affected by not allowing exceptions. However, in the example below, the user has added iTunes as an exception. If she did not have iTunes enabled in her firewall exceptions list which allows incoming connections , people would not be able to connect or listen to his shared music when his firewall is on. Give feedback.
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Expand all 1. Click the Firewall tab.