Make sure an SNMP agent is running and accessible from the Zenoss server. To check, run this command on the Zenoss server:
$ snmpwalk -c YOUR_COMMUNITY_STRING -v1 YOUR_DEVICE_IP
Tip
If you do not know your community string, try public.
If the system returns this string, then the device is not responding to your SNMP request:
Timeout: No response from xxx.xxx.xxx.xxx
