SocketChannel timout. Please help.

[Rob Chung]

Hi,
My application contains the following code:
SocketChannel s = SocketChannel.open();
s.connect(.....);
s.configureBlocking(false);
s.socket().setKeepAlive(true);
It seemed to me that the socket related to the SocketChannel gets timed out after an hour if no traffic is using this socket.
Does anyone know the default timeout of a socket?
And how to keep it alive constantly?
Thanks in advance!