DX NetOps Performance Management is not collecting metrics on the device because it is shown as inaccessible in the discovery profile history.
Device and/or network issues.
All supported DX NetOps Performance Management releases
Try the following tests from the Data Collector that will be used to discover and manage the device. If both fail it validates the problem is environmental. Are there firewalls or ACL's or other tools controlling communications that might be causing the problem?
See more in the SNMP Querying Tools section of the documentation.