We upgraded a test NFA from 10.0.4 to 20.2.7.
After the upgrade, sync is passing but "system health" in CAPC shows that the NFA is "Unreachable"
Release : 20.2
Component : NETWORK FLOW ANALYSIS CAPC/NPC
We went into "Edit Data Source" and looked at the Host name. The Host Name under "Web Console" was the fully qualified name.
We found that the this fully-qualified name was not reachable. When we changed the Host Name to a non-qualified name (that is reachable), the System Status page started to work.