McAfee Help

Mark as intruder

Mark a PC or device on your network as an intruder if you don't recognize it, or if you believe it is a potential threat. Marking a PC or device as an intruder means it is automatically blocked from accessing your PC by Personal Firewall. My Home Network notifies you when it reconnects to your network.

You can only mark a PC or device on your network as an intruder if you have McAfee Total Protection software.
1 Access the network map.
2 Click the icon of the PC or device you want to mark as an intruder.
3 Under the details of the PC or device, click Mark as Intruder.