# Search nodes unable to communicate on 5.6.9

**URL:** <https://discuss.elastic.co/t/search-nodes-unable-to-communicate-on-5-6-9/138027>\
**Category:** Elasticsearch\
**Created:** [June 29, 2018, 7:13pm UTC](https://discuss.elastic.co/t/search-nodes-unable-to-communicate-on-5-6-9/138027 "2018-06-29T19:13:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sss](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sss/32/31486_2.png) [@sss](https://discuss.elastic.co/u/sss)\
**Post date:** [June 29, 2018, 7:13pm UTC](https://discuss.elastic.co/t/search-nodes-unable-to-communicate-on-5-6-9/138027/1 "2018-06-29T19:13:05Z")

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trying to form a cluster with 2 nodes on ES 5.6.9 on linux environment...the second node is not able to connect to the first one and fails with below exception. Attaching the debug logs of ES startup

org.elasticsearch.transport.ConnectTransportException: [][10.1.99.151:9307] connect\_timeout[3s]  
at org.elasticsearch.transport.ConnectTransportException.(ConnectTransportException.java:48) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.transport.ConnectTransportException.(ConnectTransportException.java:44) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.transport.netty4.Netty4Transport.connectToChannels(Netty4Transport.java:363) ~[transport-netty4-client-5.6.9.jar:?]  
at org.elasticsearch.transport.TcpTransport.openConnection(TcpTransport.java:570) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.transport.TcpTransport.openConnection(TcpTransport.java:117) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.transport.TransportService.openConnection(TransportService.java:361) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.discovery.zen.UnicastZenPing$PingingRound.getOrConnect(UnicastZenPing.java:398) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.discovery.zen.UnicastZenPing$3.doRun(UnicastZenPing.java:507) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:674) ~[elasticsearch-5.6.9.jar:?]  
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-5.6.9.jar:?]  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1160) [?:1.8.0]  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [?:1.8.0]  
at java.lang.Thread.run(Thread.java:811) [?:2.9 (11-22-2017)]  
Caused by: io.netty.channel.ChannelException: too many channels (max: 1)  
at io.netty.channel.ThreadPerChannelEventLoopGroup.nextChild()(Unknown Source) ~[netty-transport-4.1.13.Final.jar:?]

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [June 29, 2018, 9:26pm UTC](https://discuss.elastic.co/t/search-nodes-unable-to-communicate-on-5-6-9/138027/2 "2018-06-29T21:26:40Z")

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What is the configuration for the two nodes?

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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 27, 2018, 9:26pm UTC](https://discuss.elastic.co/t/search-nodes-unable-to-communicate-on-5-6-9/138027/3 "2018-07-27T21:26:42Z")

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Closed on July 27, 2018, 9:26pm UTC

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