OS X Firewall Not Stealth | By default, the OS X Lion firewall enabled and stealth actually has a few ports open, despite the System Preferences displaying no services running and no ports open. A nessus scan will reveal the following UDP ports open and broadcasting information: 5353 / UDP 123 / UDP 127 / UDP Note: Ignore port 4242 TCP
Enable FileVault in OS X
Enable FileVault in OS X | Mac OS X since 10.3 has had a feature called FileVault. FileVault as of Mac OS X 10.5 uses 256 bit AES to encrypt your home directory. This is particularly good if you use a laptop. If your laptop is stolen, the hard drive home directory contents are basically gibberish to someone if they attempt
