after exception to closed udp socket.

[leoincedo]

socket couldn't be used

udp socket closed because any socket exception

target /255.255.255.255:54321

java.net.SocketException: Permission denied
        at sun.nio.ch.DatagramChannelImpl.send0(Native Method)
        at
sun.nio.ch.DatagramChannelImpl.sendFromNativeBuffer(DatagramChannelImpl.java:301)
        at sun.nio.ch.DatagramChannelImpl.send(DatagramChannelImpl.java:281)
        at sun.nio.ch.DatagramChannelImpl.send(DatagramChannelImpl.java:250)
        at
org.jboss.netty.channel.socket.nio.NioDatagramWorker.writeNow(NioDatagramWorker.java:518)
        at
org.jboss.netty.channel.socket.nio.NioDatagramWorker.write(NioDatagramWorker.java:446)
        at
org.jboss.netty.channel.socket.nio.NioDatagramPipelineSink.eventSunk(NioDatagramPipelineSink.java:112)
        at org.jboss.netty.channel.Channels.write(Channels.java:895)
        at
org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:233)
        at
org.jboss.netty.channel.socket.nio.NioDatagramChannel.write(NioDatagramChannel.java:233)
        at
com.dragonfly.sf2.relay.NettyRelay.messageReceived(NettyRelay.java:82)
        at
org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:345)
        at
org.jboss.netty.channel.socket.nio.NioDatagramWorker.read(NioDatagramWorker.java:410)
        at
org.jboss.netty.channel.socket.nio.NioDatagramWorker.processSelectedKeys(NioDatagramWorker.java:344)
        at
org.jboss.netty.channel.socket.nio.NioDatagramWorker.run(NioDatagramWorker.java:258)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:637)
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