Hi Currently I am using logstash forwarder , logstash and elasticsearch to monitor my syslogs on various machines. It was working fine but it stopped working all of sudden. I noticed my logstash had stopped working. When i tried restarting my logstash, it displayed following error in logstash.logs…

Error on logstash, can't connect to elasticsearch

warkolm (Mark Walkom) September 5, 2015, 11:32pm 2

This means your ES cluster is not in a healthy state.

What does curl ES_IP:9200/_cat/health show?

Topic		Replies	Views
Elasticsearch seems to appear unreachble or down Elasticsearch	13	3896	July 5, 2017
Logstash can not connect to Elasticsearch host Logstash	2	1664	December 2, 2017
Logstash.outputs.elasticsearch: Elasticsearch appears to be unreachable or down! Logstash	3	3705	December 5, 2017
Logstash Not Connecting to Elasticsearch Logstash	10	14943	July 14, 2017
Elasticsearch after taking some logs passes the message "Attempted bulk request to the elasticsearch" Elasticsearch	6	1072	February 2, 2018