# Elastic search cluster throwing error

**URL:** <https://discuss.elastic.co/t/elastic-search-cluster-throwing-error/62269>\
**Category:** Elasticsearch\
**Created:** [October 5, 2016, 12:52pm UTC](https://discuss.elastic.co/t/elastic-search-cluster-throwing-error/62269 "2016-10-05T12:52:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lijo\_Mathew](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lijo_mathew/32/12303_2.png) [@Lijo\_Mathew](https://discuss.elastic.co/u/Lijo_Mathew)\
**Post date:** [October 5, 2016, 12:52pm UTC](https://discuss.elastic.co/t/elastic-search-cluster-throwing-error/62269/1 "2016-10-05T12:52:37Z")

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My Elastic search cluster which was working fine till yesterday suddenly started throwing "failed send ping to" errors.

Full error : [2016-10-05 01:45:29,394][WARN][discovery.zen.ping.unicast] [Niles Van Roekel] [1] failed send ping to [#zen\_unicast\_1#][machineName][inet[masterName/192.186.2.1:9300]]  
org.elasticsearch.ElasticsearchIllegalStateException: can't add nodes to a stopped transport  
at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:709)  
at org.elasticsearch.transport.netty.NettyTransport.connectToNodeLight(NettyTransport.java:699)  
at org.elasticsearch.transport.TransportService.connectToNodeLight(TransportService.java:220)  
at org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing$3.run(UnicastZenPing.java:373)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

Please let me know if anyone is familiar with this error. I havent made any changes at my end

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<div class="post-metadata">

**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\
**Post date:** [October 5, 2016, 6:00pm UTC](https://discuss.elastic.co/t/elastic-search-cluster-throwing-error/62269/2 "2016-10-05T18:00:35Z")

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Could it just be that one of your nodes doesn't see other nodes anymore hence pings fail?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:14pm UTC](https://discuss.elastic.co/t/elastic-search-cluster-throwing-error/62269/3 "2017-07-05T22:14:40Z")

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