Originally I was getting a bunch of "No Route to Host" errors and tracked 
it down to being out of file handles.  I have fixed the file handle, 
problem, but I still keep getting "No route to host" errors; the odd thing 
is, the error says it can't connect to itself:  These logs are *from* 
10.52.207.36.  I turned up trace logging on transport, but I'm not seeing 
it.

[2014-08-02 02:45:15,044][TRACE][discovery.zen.ping.unicast] [Box IV] [2] 
failed to connect to [Box 
IV][Mx8kHzp6S1K-0_FiNp36VA][elk3][inet[/10.52.207.36:9300]]
org.elasticsearch.transport.ConnectTransportException: [Box 
IV][inet[/10.52.207.36:9300]] connect_timeout[30s]
    at 
org.elasticsearch.transport.netty.NettyTransport.connectToChannels(NettyTransport.java:727)
    at 
org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:656)
    at 
org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:624)
    at 
org.elasticsearch.transport.TransportService.connectToNode(TransportService.java:146)
    at 
org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing$3.run(UnicastZenPing.java:289)
    at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.net.NoRouteToHostException: No route to host
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:712)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.connect(NioClientBoss.java:150)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:105)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:79)
    at 
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42)
    at 
org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
    at 
org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
    ... 3 more
[2014-08-02 02:45:15,045][WARN ][transport.netty          ] [Box IV] 
exception caught on transport layer [[id: 0xd840123a]], 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:712)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.connect(NioClientBoss.java:150)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:105)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:79)
    at 
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
    at 
org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42)
    at 
org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
    at 
org.elasticsearch.common.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:744)

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