Use copy‑and‑paste for both fields to avoid typos. Some email clients split the key across multiple lines—make sure you capture the entire string [7†L41-L42].

A sensor is a single monitoring metric on a device. Examples include: One switch port A CPU load reading Free disk space on a drive A specific URL check

If you want to test the software or run a small lab, you can get a valid license key legally for free. Visit the official Paessler website. Download the PRTG Network Monitor installer. During setup, Paessler provides a . This key gives you unlimited sensors for 30 days .