rrperez

SNMP works fine on the servers, and I can access the servers SNMP through MIB walk.

how about on OS versions, my NPM gets question mark logo on their eth0 and lo interfaces. Does anyone know how to fix this?

Server Details Server Data

Another thing is that, even though the said devices are monitored UP and responding to ping, sometimes alerts says they are down. 

Thanks for the response matt, Yes they are all snmp devices, most likely servers. I can't view the data from the CPU Load and Memory Use and also the eth0, lo and other interfaces are in the unknown status or in a question mark logo.