A Passive Monitor Listener is the component in passive monitors that listens for events to occur. When an event occurs, the listener notifies WhatsUp Gold and associated actions are fired.
WhatsUp Gold in installed with three Passive Monitor Listeners:
Important: Before you can configure passive monitors, you must configure the coinciding Passive Monitor Listener(s) on the WhatsUp Gold console via Program Options. For more information, see Enabling the SNMP Trap listener, Enabling the Syslog listener, and Enabling the Windows Event Log listener.