def check_port_forward_request(self, address, port):
return False<EOL>
Handle a request for port forwarding.  The client is asking that
connections to the given address and port be forwarded back across
this ssh connection.  An address of C{"0.0.0.0"} indicates a global
address (any address associated with this server) and a port of C{0}
indicates that no specific port is requested (usually the OS will pick
a port).

The default implementation always returns C{False}, rejecting the
port forwarding request.  If the request is accepted, you should return
the port opened for listening.

@param address: the requested address
@type address: str
@param port: the requested port
@type port: int
@return: the port number that was opened for listening, or C{False} to
    reject
@rtype: int