why socketChannel.write always return 0 ，server somethings can not send message to the client

[tantom]

hi all, i am writing an chat server application using netty. i use jdk1.6 

some times the client(C#) can't get message sent by the server

when i debug in the netty(v3.2.1)

in the NioWorker.writeNow(NioSocketChannel channel, int writeSpinCount)
method

the channel.currentWriteEvent always has an the same event(it should be the
first blocking write evt), so the message can't send to the client

and i debug to buf.getBytes(bufIdx, channel.socket,
buf.writerIndex()-bufIdx) i found that socketChannel.write method always 

return 0, i am new to socket develop, it's that means server can't write to
the client or something else?

the client still can send message to the server.

how to resolve this? or someone can tell me some point?

i don't know how this can happen again, it sometime happen.
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