“What? The Mac has a firewall? Who knew? Actually, OS X has had a firewall since forever, and Apple is so convinced the Mac is truly secure the built-in software firewall is turned off by default,” Jeffrey Mincey writes for Mac360.
“Turning on the Mac’s firewall is easy enough but managing it is not. Open System Preferences > Security & Privacy > Firewall. Click, Turn On Firewall. That’s it. Almost. Click Firewall Options to manage specific apps,” Mincey writes. “Or, use Murus Lite instead.”
Mincey writes, “Murus Lite is the entry-level app which is more of a user interface for the Mac’s built-in software firewall.”
More info and screenshots in the full article here.