Hi Andy,
The Primary Polling Engine has to be online when you connect the Additional Polling Engine (unless you are on NPM v9.5.1 or less).
The Additional Polling Engines will authenticate with the Primary Polling Engine, then connect directly to the database server.
From here on after, the Additional Polling engines will only connect to the Primary Polling Engine if or when you need to assign a node to said Additional Polling Engine. Until then, the Additional Polling Engine will only connect to the DB.
1. Make sure the Primary Polling Engine is online and running.
2. You may need to run Conf Wiz if no connection between Primary and Additional Polling Engine is present. Check the Polling Engines status in Settings > Polling Engines in the web console.
3. As above, check Polling Engine status in Settings page. The run test like Discover, Poll Now, List Resources for nodes assigned to Additional Polling Engine(s)
Deltona