Active monitors are the WhatsUp Gold feature responsible for watching over device services. Active monitors regularly query the device services for which they are configured and wait for responses. If a query is returned with an expected response, the queried service is considered "up." If a response is not received, or if the response is not expected, the queried service is considered "down" and a state change is issued on the device.
Active monitors are stored in and configured from the Active Monitor Library.
For information about active monitor types, see Supported active monitors.