I am tring to add a node, SNMPV1, Read public. When I try to add the message is the node did not reply to SNMPV1 with public. The same node responds properly using OidView Professional with public & SNMPV1. It is a simple piece of network gear, a Tap.
Any clues? There's no config setting for allowed IP addresses or anything like that.
I suggest you to run a network trace on the Orion NPM server using Wireshark. Use OIDView Pro and then try to add the device in NPM. You should know if Orion sends properly the SNMP Requests and get a response or not. If it gets a response which type of response. This should help to find out where is the issue.