Inactivity
The probe can disconnect from the target system and shut down if there is no event activity for a predefined amount of time.
The Inactivity property specifies the maximum time (in seconds) that the probes waits, without receiving any messages from the NNMi system. If that amount of time passes by, the probe shuts down.
To ensure that the probe never shuts down because of inactivity, set the property to 0.