We recently set up a new instance of OpenNMS Horizon ver 28.0.1. We were previously running OpenNMS Horizon ver 22.0.2. After setting up the nodes on the new OpenNMS 28.0.1 server we are not finding SNMP Node Data or SNMP Interface Data when opening Resource Graphs on some nodes.
We have the same MIBs loaded in the new server as the old server.
The node (Fortigate firewall) is configured to allow SNMP access from both new and old OpenNMS servers.
Any help would be greatly appreciated.