Can’t connect to server

Server Version#: 1.43.3.10861
Player Version#: can’t find
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

Plex server (alhs) sits on MacMini and seems to be working ok. Plex client is on AppleTV, which is on the same network as macmini, but it says that alhs is unavailable. It has worked in the past. So it knows that name of the server…? What should my next step be?

On the user account that you used to post in here, there is no Apple-based server. Only a server running on a QNAP NAS has been seen ~9 months ago. And that one had a different name.