To make WFilter work, you need to setup port mirroring in your switch. However, sometimes you might still cannot monitor other computers even port mirroring is configured. It has several possibilities:

1. Misconfigured port mirroring. (wrong port, incorrect settings...)
2. Cable problem.
3. Network card problem.
4. Incorrect WFilter settings. (wrong ip segment or monitoring adapter...)

To locate the problem, first we need to confirm whether packets are mirrored to WFilter computer. It can be checked in a simple way following below steps:

Upon successful mirroring, the "Received" packets number shall be much larger than the "Sent" packets. If not, you need to check certain mirroring settings or cable connections.