Unable to browse http://server-ip:9200

I can browse kibana from a client machine http://172.16.10.10:5601

I can curl -XGET https://localhost:9200 -u admin:admin --insecure

I get curl: (56) Received HTTP code 403 from proxy after CONNECT
when http or https:// 172.16.10.10:9200 -u admin:admin --insecure

I have changed the elasticsearch network.host to 0.0.0.0

Any Suggestion