# Getting ConnectTransportException for 127.0.0.1:9300 **URL:** \ **Category:** Elasticsearch\ **Created:** [August 12, 2016, 6:14am UTC](https://discuss.elastic.co/t/getting-connecttransportexception-for-127-0-0-1-9300/57886 "2016-08-12T06:14:32Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Devanshi\_Choudhary](https://avatars.discourse-cdn.com/v4/letter/d/e68b1a/32.png) [@Devanshi\_Choudhary](https://discuss.elastic.co/u/Devanshi_Choudhary)\ **Post date:** [August 12, 2016, 6:14am UTC](https://discuss.elastic.co/t/getting-connecttransportexception-for-127-0-0-1-9300/57886/1 "2016-08-12T06:14:33Z")
Hi, I am setting up elasticsearch in my environment and using 3 virtual boxes, each Virtual box has 2 instances of elasticsearch configured - one is master node and other is data node So when I start my server1(Hostname:slabc113 , port no 10.xxx.yy.zzz) - master node (it starts successfully) But when I start my server2(Hostname:slabc118, port no 10.aaa.bb.ccc) master node , it starts but throws below exception [2016-08-12 05:58:44,406][WARN][cluster.service] [slabc118] failed to connect to node [{sl73commapd113}{ahiare8hQDKPdG1CAsQ3Lg}{127.0.0.1}{127.0.0.1:9300}{master=false}] ConnectTransportException[[slabc113][127.0.0.1:9300] connect\_timeout[30s]]; nested: ConnectException[Connection refused: /127.0.0.1:9300]; at org.elasticsearch.transport.netty.NettyTransport.connectToChannels(NettyTransport.java:987) at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:920) at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:893) at org.elasticsearch.transport.TransportService.connectToNode(TransportService.java:260) at org.elasticsearch.cluster.service.InternalClusterService.runTasksForExecutor(InternalClusterService.java:590) at org.elasticsearch.cluster.service.InternalClusterService$UpdateTask.run(InternalClusterService.java:772) at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:231) at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:194) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.net.ConnectException: Connection refused: /127.0.0.1:9300 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$1.run(DeadLockProofWorker.java:42) [2016-08-12 05:59:40,481][WARN][cluster.service] [slabc118] failed to reconnect to node {slabc113}{ahiare8hQDKPdG1CAsQ3Lg}{127.0.0.1}{127.0.0.1:9300}{master=false} ConnectTransportException[[sl73commapd113][127.0.0.1:9300] connect\_timeout[30s]]; nested: ConnectException[Connection refused: /127.0.0.1:9300]; at org.elasticsearch.transport.netty.NettyTransport.connectToChannels(NettyTransport.java:987) at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:920) at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:893) at org.elasticsearch.transport.TransportService.connectToNode(TransportService.java:260) at org.elasticsearch.cluster.service.InternalClusterService$ReconnectToNodes.run(InternalClusterService.java:828) 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) Caused by: java.net.ConnectException: Connection refused: /127.0.0.1:9300 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) can someone tell me the reason it is trying to connect to 127.0.0.1 ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [August 12, 2016, 6:26am UTC](https://discuss.elastic.co/t/getting-connecttransportexception-for-127-0-0-1-9300/57886/2 "2016-08-12T06:26:12Z")
What version are you on? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [August 12, 2016, 7:28am UTC](https://discuss.elastic.co/t/getting-connecttransportexception-for-127-0-0-1-9300/57886/3 "2016-08-12T07:28:46Z")
You have to define the unicast list of nodes. By default it tries local interface only ---
**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, 10:28pm UTC](https://discuss.elastic.co/t/getting-connecttransportexception-for-127-0-0-1-9300/57886/4 "2017-07-05T22:28:07Z")