Port forwarding is a technique used to allow remote access to a device or service on a private network from outside the network. It involves directing incoming network traffic from a specific port on the router to a different port on a device within the private network.

First, his mouse cursor began moving on its own, drifting toward the corner of the screen. Then, a command prompt window flashed briefly and vanished. Leo’s stomach dropped. He checked his Task Manager and saw a process he didn’t recognize— system_update_helper.exe —consuming 90% of his CPU. He tried to close it. Access denied.