McAfee Help

Set the security type to Lockdown

You can select the Lockdown security type to block all incoming and outgoing traffic between your PC and the Internet. You might need to do this if you suspect that a program on your PC is sending or receiving malicious data and you want to protect other PCs on your network.

1 Open the Firewall settings page.
2 Click Traffic Controller.
3 Select Lockdown.
4 Click Apply.
If you are locking down your PC because you suspect a program on your PC is sending malicious data, make sure to follow up with a full scan of your PC.