If you use Macintosh OS X, CUIT recommends that you use the
built-in OS X firewall to help protect your computer from viruses and
- Open System Preferences by selecting it from the Apple menu
or clicking it in your Dock.
- Select Sharing from the Internet & Network
- Click the Firewall tab and click Start. It will say
Firewall On above the button once you've activated the
- You may allow access to your Mac on a service-by-service basis by
selecting the individual services in the Allow box. If you don't
understand what any of this means, you should make sure that NONE of
the services are allowed.
- Quit System Preferences.
Apple Article on Mac OS X Firewall
To reach this page quickly in the future, use the keyword macfirewall.
Send reports of security incidents, attacks, or questions to email@example.com