# Connection issue with a slave node

**URL:** <https://discuss.elastic.co/t/connection-issue-with-a-slave-node/45413>\
**Category:** Elasticsearch\
**Created:** [March 25, 2016, 5:02am UTC](https://discuss.elastic.co/t/connection-issue-with-a-slave-node/45413 "2016-03-25T05:02:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![boreal](https://avatars.discourse-cdn.com/v4/letter/b/cab0a1/32.png) [@boreal](https://discuss.elastic.co/u/boreal)\
**Post date:** [March 25, 2016, 5:02am UTC](https://discuss.elastic.co/t/connection-issue-with-a-slave-node/45413/1 "2016-03-25T05:02:14Z")

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Hi,  
I have two nodes cluster which was working fine for about 3 weeks, until today. A data node refuses to connect to the master node with this error. I can ping either node and the data seems intact, but they just cannot talk to each other. Does anyone know how to fix this? Thanks!!

[2016-03-24 23:59:04,828][WARN][shield.transport.netty] [node-2] exception caught on transport layer [[id: 0xdc15a179]], closing connection  
java.net.NoRouteToHostException: No route to host  
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)  
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)  
at org.jboss.netty.channel.socket.nio.NioClientBoss.connect(NioClientBoss.java:152)  
at org.jboss.netty.channel.socket.nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:105)  
at org.jboss.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:79)  
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)  
at org.jboss.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42)  
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)  
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)  
at java.lang.Thread.run(Thread.java:745)

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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, 11:05pm UTC](https://discuss.elastic.co/t/connection-issue-with-a-slave-node/45413/2 "2017-07-05T23:05:17Z")

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