# File lib/net/ssh/service/forward.rb, line 146
    def cancel_remote(port, host="127.0.0.1")
      session.send_global_request("cancel-tcpip-forward", :string, host, :long, port) do |success, response|
        if success
          @remote_forwarded_ports.delete([port, host])
        else
          raise Net::SSH::Exception, "could not cancel remote forward request on #{host}:#{port}"
        end
      end
    end