![]() If you want to test out of the efficacy of Stealth Mode, you can use ping at the command line or use Network Utility to attempt to discover the Mac from another Mac. The Mac is now in stealth mode, meaning it will not respond to certain types of common network communication and discovery attempts. Close out of System Preferences as usual.Check the box for “Enable Stealth Mode” then click OK.Click on the unlock button and authenticate with an administrator password, click on “Turn On Firewall” if it hasn’t been turned on yet, then then click on the “Firewall Options” button.Go to the “Security & Privacy” preference panel and select the “Firewall” tab.Go to the Apple menu and choose System Preferences.Stealth Mode is an optional feature of the Mac firewall available to virtually every somewhat modern version of Mac OS X: How to Enable Stealth Mode Firewall in Mac OS X Additionally, if you don’t trust the network you’re on whatsoever, you may want to disconnect and find a safer one go all out and block every possible incoming network connection to the Mac instead. If your Mac is simply on a closed home network behind a general router and firewall and accompanied by friendly computers and users, turning on stealth mode may be more problematic than helpful, and is really not recommended for computers on trusted LAN situations. Because Stealth Mode can interfere with some network functions and troubleshooting methods to and from a Mac with this feature enabled, using Stealth Mode is really only appropriate for advanced users, or for those who routinely use their Macs on untrusted public or private networks and who want to improve their machines security in that environment.
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