Unbind port for IoAcceptor is not working

[Hardik Kubavat]

Hi,

I am unbind the port from IoAcceptor using
==>    acceptor.unbind(new InetSocketAddress(portNo));

So when we try to bind this same port on acceptor it's throws Exception 
with Following message
Address already in use.

As per my requirement I need to bind and unbind port dynamically. And It 
is possible that same port we need to unbind and than bind again.