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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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java.net.UnknownHostException: localhost:9200 at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.elasticsearch.common.netty.channel.socket.oio.OioClientSocketPipelineSink.connect(OioClientSocketPipelineSink.java:109) at org.elasticsearch.common.netty.channel.socket.oio.OioClientSocketPipelineSink.eventSunk(OioClientSocketPipelineSink.java:69) at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:574) at org.elasticsearch.common.netty.channel.Channels.connect(Channels.java:634) at org.elasticsearch.common.netty.channel.AbstractChannel.connect(AbstractChannel.java:207) at org.elasticsearch.common.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:229) at org.elasticsearch.common.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:182) at org.elasticsearch.transport.netty.NettyTransport.connectToChannelsLight(NettyTransport.java:769) at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:737) at org.elasticsearch.transport.netty.NettyTransport.connectToNodeLight(NettyTransport.java:709) at org.elasticsearch.transport.TransportService.connectToNodeLight(TransportService.java:154) at org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing$3.run(UnicastZenPing.java:376) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)