title: 503 Error Service Unavailable error kibana
body: <p>I have installed elasticsearch 5.5, logstash 5.5 and kibana 5.5 on same aws ec2 instance for learning purpose. Elasticsearch, logstash and kibana are running but when I open kibana on port 5601 then a default page get open with 503 service error, when I click on management, dev_tools, discovery but every time same page get loaded with 503 error. I am unable to configure elasticsearch with kibana now. I am providing images to show how it behaves</p>
  
  <p><a href="https://i.stack.imgur.com/EDxQ3.png" rel="nofollow noreferrer">Kibana Default Page</a></p>
  
  <p>Now when I click on mangement(gear shaped symbol), then it come as</p>
  
  <p><a href="https://i.stack.imgur.com/A3Rsc.png" rel="nofollow noreferrer">Kibana management page</a></p>
  
  <p>There is no error or important message found in kibana logs.</p>
  
  <p>I have provided correct elasticsearch server host in kibana.yml, set server.requestTimeout to 2 minutes and provide correct elasticsearch server URL. Still this error is coming.</p>
  
  <p>Thanks in advance for help</p>