Hi, I am in the same situation. Kibana worked for me, then after some time while playing with indexes it started to behave strangely, finally after a reboot it refuses connection to port 5601
I tried to uninstall, deleted all /opt/kibana files, reinstalled latest version, nothing is working
I even cannot access any log, I created a log file for kibana and set it into kibana.yml but it is always zero sized.
The service starts after an initial failure but connection to the port is denied.
I searched for an answer for 7 hours. I found that that in the kibana.yml file, if you change port: 5601 to server.port: 5601, I can connect to the server and port with curl. I have another error message and Kibana is not showing me Elasticsearch yet, but that is progress. And then after rebooting it would not start. However, changing it back to port: 5601 and restarting Kibana caused it to work again.
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