SOLVED: Can not play media new install

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Are you having issues other than the slow HTTP response? Because that warning, if you look closely, is saying it took just over half a second to get the response. If you're not having issues, you can ignore, raise the limit, or disable that warning entirely.

If you see other issues, you can use the IP address of the server internally (i.e., on the same network) which might decrease that response time. You can also investigate hairpin/loopback DNS which will make sure your domain is identified as the IP address of the server when on the same network rather than going out to the Internet to resolve the domain, then pointing back to your external IP, then internal IP (depending on setup).

However, if the only symptom is this warning and you're satisfied with the performance of your server, I'd recommend to stop chasing ghosts.

EDIT: I see the topic says you're unable to play media. Can you post your Jellyfin log (Dashboard > Logs) to a pastebin service? My guess would be if you lose connection to the NFS server, Jellyfin doesn't pick it up when you reconnect.