Single server small network and in the Control Panel, the server icon shows unknown:
Why would this happen - and what's the implication? Clients connect OK, all seems OK, but it's nevertheless unnerving.
Only things attached is a monitor, bog standard keyboard,and two USB drives for backups.
Nothing in the error logs other than expected annoyance stuff Alerts that are safe to ignore - e.g. took 'x' seconds for this or that to complete.