A system and method for detecting computer port inactivity are disclosed. In one embodiment, a system includes a router that has a first interface to communicate with a first connection at an end-user computer and a second interface to communicate with a second connection at a distributed computer network. The system includes detection logic responsive to the first interface to detect inactivity at the end-user computer and further includes blocking logic responsive to the detection logic. The blocking logic is operable to selectively initiate a blocking signal to disable communicating data received at the second interface to the end-user computer via the first interface. The detection logic and the blocking logic are embedded within a port of the router.