Kibana cannot connect to elasticsearch behind nginx with ssl enabled

Hi, all

Elasticsearch version: 5.4.0
Kibana version: 5.4.0

Kibana is running behind nginx, enabled ssl on nginx
3 elasticsearch nodes behind nginx too, with also ssl enabled,

Now, clients can communicate with elasticsearch successfully, e.g. https://es.demo.com, but what I'm confused is, kibana can't connect to elasticsearch, I really don't know why (confirmed no network issue).
Anyone can help? Do I have to use X-Pack instead (Or X-Pack is a must to encrypt connection from kibana to elasticsearch)? Thanks.

Can anyone help with this? Thanks a lot.

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