How to use the OS X firewall | Macworld
Firewall on/off? - Apple Community May 03, 2011 Best Free Firewalls for PC and Mac Jan 31, 2014 Vallum - macOS Application Firewall
The four Mac security options everyone should know | Macworld
Mac computers can get viruses and need file-based antivirus protection. Additionally, they need the other layers of protection offered in a device security software suite such as Firewall, Intrusion Prevention and Anti-phishing Protection. Norton has been helping to protect Mac computers for decades.
May 03, 2011
This basic firewall closes off unused network service ports, but lets you create exceptions for specific programs running on your computer. To check your version of OS X, open the Apple menu (the blue apple icon in the upper left corner of the screen), and select About This Mac. Firewall on/off? - Apple Community May 03, 2011 Best Free Firewalls for PC and Mac Jan 31, 2014 Vallum - macOS Application Firewall Vallum adds the ability to block outbound connections, so it is the perfect companion for the macOS firewall and they can be used together. Additionally, the macOS built-in pf network-layer firewall can be activated to provide even more security to your Mac.