Upgrading Graylog 3.3.9-1 (OVA) to 4.0.1-1 kills the server

[tmacgbay]

Could be the same issue I was having:

4.0 upgrade - Browser access failure with DNS name but IP works

Upgraded to 4.0 and now modern browsers fail (Chrome, Firefox, Edge) on hostname access but I am able to connect if I use the server IP. interestingly I can access the server from the most recent version of Internet Explorer with the hostname I was using before. no https… not using certificates (yet) The Browser error message is: Request has been terminated Possible causes: the network is offline, Origin is not allowed by Access-Control-Allow-Origin, the page is being unloaded, etc. and wh…

Which incidentally is here in the upgrade notes:

https://docs.graylog.org/en/4.0/pages/upgrade/graylog-4.0.html#deprecation-of-cluster-stats-endpoints