# File lib/net/ssh/service/forward/driver.rb, line 262
          def cancel_remote( remote_port, remote_host="127.0.0.1" )
            writer = @buffers.writer
            writer.write_string remote_host
            writer.write_long remote_port.to_i

            @connection.global_request( "cancel-tcpip-forward", writer
            ) do |success, response|
              if success
                @remote_forwards.delete remote_port
              else
                raise Net::SSH::Exception,
                  "could not cancel remote forward request on " +
                  "(#{remote_port},#{remote_host})"
              end
            end
          end