Auto Update feature is failing.
In this environment it is needed to whitelist the URL's being accessed.
Which URL's access the Auto Update feature to?
Make sure any URL starting with https://api.spotlightessentials.com and https://spotlight.blob.core.windows.net are allowed from server where the Diagnostic Server resides in.
Additionally, go to Configure->Diagnostic Server->Configure the auto-update facility to disable it .
Restart Diagnostic Server services.