Configuring the Firewall
When you turn the firewall on, it does its best to block suspicious data trying to get into your Macintosh. However, you might want to take some time to customize the firewall. Three options for strengthening your firewall include:
Block all incoming connections This option blocks all connections except those basic services required to use the Internet. This provides greater protection, but at the possible expense of preventing your Macintosh from doing certain things on the Internet, such as video conferencing.
Automatically allow signed software to receive incoming connections This provides greater protection, but at the expense of blocking legitimate software if it doesn't contain a certificate.
Enable stealth mode This ...
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