Errors in kibana log

I have receive such errors in kibana logs:

{"type":"log","@timestamp":"2017-02-21T06:33:14Z","tags":["warning","elasticsearch"],"pid":3049,"message":"No living connections"}

{"type":"log","@timestamp":"2017-02-21T06:33:16Z","tags":["warning","elasticsearch"],"pid":3049,"message":"Unable to revive connection:"}

curl request to elasticsearch host is also failed:

curl -i http://localhost:9200

curl: (7) couldn't connect to host

How can i fix it?

If curl doesn't work then it looks like ES is down. So check the logs there./

Elasticsearch is working properly. What can be reason of this error? ES is installed on other than kibana host

Is ES listening to loopback?

I don't understand. Do you mean value in elasticsearch.yml?

Yes. If ES is on a remote host then you need to change the default settings so it's not on loopback.

Have a read of

Yes, but i haven't option in elasticsearch.yml. Should me add it here also as a

You don't need to set those, just the

Read that link I posted.