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    Root Cause Analysis

    1. java.net.ConnectException

      Connection refused

      at sun.nio.ch.UnixAsynchronousSocketChannelImpl.checkConnect()
    2. Java RT
      Thread.run
      1. sun.nio.ch.UnixAsynchronousSocketChannelImpl.checkConnect(Native Method)[na:1.7.0_80]
      2. sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishConnect(UnixAsynchronousSocketChannelImpl.java:252)[na:1.7.0_80]
      3. sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(UnixAsynchronousSocketChannelImpl.java:198)[na:1.7.0_80]
      4. sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(UnixAsynchronousSocketChannelImpl.java:213)[na:1.7.0_80]
      5. sun.nio.ch.EPollPort$EventHandlerTask.run(EPollPort.java:293)[na:1.7.0_80]
      6. java.lang.Thread.run(Thread.java:745)[na:1.7.0_80]
      6 frames