What does 'Connection reset by peer' means on JBoss EAP?

Issue

• We noticed a different message in server.log and we would like to know what it is.

  Caused by: java.io.IOException: Connection reset by peer
  

• Seeing the below message at the master server of the JMS cluster.

  2019-02-25 08:32:01,397 WARNING [io.netty.channel.DefaultChannelPipeline] (default I/O-6) An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.: java.io.IOException: Connection reset by peer
      at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
      at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
      at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
      at sun.nio.ch.IOUtil.read(IOUtil.java:192)
      at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
      at org.xnio.nio.NioSocketConduit.read(NioSocketConduit.java:289)
      at org.xnio.conduits.ConduitStreamSourceChannel.read(ConduitStreamSourceChannel.java:127)
      at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288)
      at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1100)
      at org.xnio.netty.transport.AbstractXnioSocketChannel$ReadListener.handleEvent(AbstractXnioSocketChannel.java:435)
      at org.xnio.netty.transport.AbstractXnioSocketChannel$ReadListener.handleEvent(AbstractXnioSocketChannel.java:379)
      at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
      at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66)
      at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:89)
      at org.xnio.nio.WorkerThread.run(WorkerThread.java:591)
  

• We see this exception in server log

  java.io.IOException: Connection reset by peer
      at sun.nio.ch.FileDispatcherImpl.writev0(Native Method)
      at sun.nio.ch.SocketDispatcher.writev(SocketDispatcher.java:51)
      at sun.nio.ch.IOUtil.write(IOUtil.java:148)
      at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:502)
      at org.xnio.nio.NioSocketConduit.write(NioSocketConduit.java:162)
      at io.undertow.conduits.BytesSentStreamSinkConduit.write(BytesSentStreamSinkConduit.java:70)
      at io.undertow.conduits.AbstractFramedStreamSinkConduit.doWrite(AbstractFramedStreamSinkConduit.java:137)
      at io.undertow.conduits.AbstractFramedStreamSinkConduit.flushQueuedData(AbstractFramedStreamSinkConduit.java:207)
      at io.undertow.server.protocol.ajp.AjpServerResponseConduit.write(AjpServerResponseConduit.java:273)
      at io.undertow.server.protocol.ajp.AjpServerResponseConduit.write(AjpServerResponseConduit.java:357)
      at org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:158)
      at io.undertow.channels.DetachableStreamSinkChannel.write(DetachableStreamSinkChannel.java:179)
      at io.undertow.server.HttpServerExchange$WriteDispatchChannel.write(HttpServerExchange.java:2039)
      ...