An existing connection was forcibly closed by the remote host

[neilson9]

Hi,
Ive been testing netty (CR2 nightly snapshot) for the last few weeks after
integrating it into our environment. At a stage
where we experience a burst of traffic - 70-100 machines all establish
connections to stream results, we end with many of the experiencing
'existing connection was forcibly closed by the remote host' (as below) -
its only during this short burst where the exception is experienced. We also
have retry logic to throw the existing conection establish a new one - they
do eventually get through but also experience subsequent exceptions.

The environment is a series of windows machines -the main servers nodes are
Windows2003Server (Ive upped the Tcpip.sys to 2000) - and while monitoring
the network we peak at 1095 connections.

I would have thought this number of connections wouldnt be a problem - is
this a windows OS problem or something I can work around, or tune in Netty? 

Regards Neil.

platform: java6u13, Win2003serverSP1, Netty 3.1CR2 snapshot from last week

1666,	2009-07-03 08:15:26,290 WARN New I/O client worker #2-3
(netty.NettyClientHandler)	
com.liquidlabs.transport.netty.NettyClientHandler at 1c05149 m:null
Client[null]
TalkingTo[stcp://LONMS02003:10005/_startTime=1246551675395&udp=0]
Channel[[id: 0x013aaba7, /0.0.0.0:4680 => LONMS02003/172.26.32.245:10005]]
Unexpected exception from downstream, latch[null]
1667,	java.io.IOException: An existing connection was forcibly closed by the
remote host
1668,		at sun.nio.ch.SocketDispatcher.read0(Native Method)
1669,		at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:25)
1670,		at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
1671,		at sun.nio.ch.IOUtil.read(IOUtil.java:206)
1672,		at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:236)
1673,		at
org.jboss.netty.buffer.HeapChannelBuffer.setBytes(HeapChannelBuffer.java:163)
1674,		at
org.jboss.netty.buffer.AbstractChannelBuffer.writeBytes(AbstractChannelBuffer.java:432)
1675,		at
org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:312)
1676,		at
org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:282)
1677,		at
org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:203)
1678,		at
org.jboss.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:53)
1679,		at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
1680,		at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
1681,		at java.lang.Thread.run(Thread.java:619)

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