Unable to discover using OpenManage enterprise

I'm standing up a test-server to replace our old essentials one. I've managed to install the server and login via the web. I set up NTP and now I'm looking to discover devices. However, I haven't been successful importing a variety of devices that existed on my essentials server, including servers (windows), idrac, and MD storage devices. I've tried using DNS and IP addresses. Domain accounts (for the windows hosts) as well as local accounts. I've attempted SNMP for the MD storage devices. Some are on the same network as the OM Enterprise server, others are not.

Each discovery log comes back with: 

CGEN1013 : Unable to connect to the device over because a connection error occurred.