Details
While in Stealth mode the computer will not respond to unsolicited probes, dropping that traffic. http://support.apple.com/en-us/HT201642 Stealth mode on the firewall minimizes the threat of system discovery tools while connected to a network or the Internet.
Solution
Perform the following to implement the prescribed state: Open System Preferences Select Security & Privacy Select Firewall Options Select Enable stealth mode Alternatively: Run the following command in Terminal: sudo /usr/libexec/ApplicationFirewall/socketfilterfw –setstealthmode on Impact: Traditional network discovery tools like ping will not succeed. Other network tools that measure activity and approved applications will work as expected.
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Unix.