Connection Failed
Possibility #1: Your elasticsearch server is down or unreachable
This can be caused by a network outage, or a failure of the Elasticsearch process. If you have recently run a query that required a terms facet to be executed it is possible the process has run out of memory and stopped. Be sure to check your Elasticsearch logs for any sign of memory pressure.Possibility #2: You are running Elasticsearch 1.4 or higher
Elasticsearch 1.4 ships with a security setting that prevents Kibana from connecting. You will need to set http.cors.allow-origin in your elasticsearch.yml to the correct protocol, hostname, and port (if not 80) that your access Kibana from. Note that if you are running Kibana in a sub-url, you should exclude the sub-url path and only include the protocol, hostname and port. For example, http://mycompany.com:8080, not http://mycompany.com:8080/kibana.Click back, or the home button, when you have resolved the connection issue