|AlienVault Ticket ID||ENG-101869|
In AlienVault USM Appliance when trying to enable the availability monitoring (Nagios), it fails for assets with plugin(s) enabled or that had been enabled in the past.
The same behavior is sometimes reported if the device was formerly enabled for availability monitoring. The system reports as if the "asset is already being monitored" and does not enable monitoring.
Delete the conflicting asset and re-add to enable availability monitoring.
See also the Asset Administration topic in the AlienVault USM Appliance User Guide.