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Not able to get faulted and closed event in case of DuplexChannelFactory


I am using DuplexChannelFactory to create proxy for my wcf server. I am using nettcpbinding.
I have registered faulted and closed events. Now will stop/close my wcf server application in this case I am not getting any fired on my client side. I don't know why this is not coming.
But if I use DuplexClientBase and inherit from it and then create proxy and register these event and now if I close my wcf server application i'll get these event notification.

Please let me know about these two implementation. why the behavior is different in both case.