Nagios Support Forum

Finally found the issue!

When routing is enabled, you need to then tell the switch how to handle snmp requests. Basically to send snmp responses to the queries back to the address they came from, in this instance my Nagios XI server.

In the CLI, of the switch, enter the config and enter:

HP Switch(config) # snmp-server response-source dst-ip-of-request

That is great news that the problem has been resolved. Thank you for posting the fix, that will help out other users as well.
Let us know if it is alright to mark the post as solved and lock it up for you.

Solved indeed! Thanks for everyones help and pointers.