if you setup a reverse proxy for Kibana, shouldn't you rather try to access http://hostname instead of http://hostname:5601? If you are trying to access Kibana via hostname:5601 have you made sure it's really be accessible from the outside network, and not just within your server?
I can't provide any details about your network configuration. Does Kibana respond, if you try to access it from the server host itself via localhost:5601?
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