Transcript
On an Apple Mac, you can access the firewall using the System Preferences. Choose Security and Privacy. On the Security and Privacy Preferences pane, select the Firewall tab. If the firewall is not already enabled, click the Turn On Firewall button. You may need to click the padlock icon and provide your password to do this. Once the firewall is enabled, you can access its settings by clicking the Firewall Options button. Clicking the Block All Incoming Connections button will stop network traffic from external computers other than the traffic relating to some basic network services.
The list of software under this check box specifies the programmes that are allowed to send and receive data from the network. Software can be added to this list by clicking the Plus button underneath it. The check box to automatically allow assigned software to receive incoming connections allows those applications that have been digitally signed to send and receive data.
Finally, the Stealth Mode button can be used to prevent your computer from responding to ping messages that are sometimes used by attackers to identify potential targets. Any changes we make to the firewall settings have to be confirmed by clicking the OK button at the bottom of the window.