If you can ping the loopback address, then it should be discoverable by that address. So SNMP is being blocked. Check your ACL's to see if it's blocking SNMP access to the loopback address.
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If you can ping the loopback address, then it should be discoverable by that address. So SNMP is being blocked. Check your ACL's to see if it's blocking SNMP access to the loopback address.