NEO GUI shows healthy switch and hosts, but no network links

CentOS 7.4 and NEO 2.3.1 new install. I have an SN2700 and two ethernet hosts appearing in NEO Managed Devices with green check-marks for status and health, but no network links appear in the map. If I try to run Network Health connectivity tests I get “Could not find at least 2 hosts connected to the fabric” error.

Documentation on host side configuration is pretty thin. I do have NEO host installed but I’m not sure if I’m supposed to be running some sort of host side daemon or something like that. They have the green status/health check-marks though, so I don’t have much info to go on as far as debugging.