cancel_local (Net::SSH::Service::Forward::Driver)

    # File lib/net/ssh/service/forward/driver.rb, line 245
              def cancel_local( local_port, bind_address="127.0.0.1" )
                key = [ local_port.to_i, bind_address ]

                forward = @local_forwards[ key ]
                @local_forwards.delete key

                forward[ :socket ].shutdown
                forward[ :thread ].terminate

                true
              end