Home/ Questions/Q 6251311
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-24T13:35:28+00:00

I want a cloud machine to send a message to a machine behind a

  • 0

I want a cloud machine to send a message to a machine behind a corporate NAT / Firewall.

My idea is to install on the corporate machine a client which sends a long HTTP request to the cloud machine and when the cloud has a message it returns the response.

I thought I invented the wheel until I read about “http tunneling” (is this what I am doing?).
I also read that some firewalls block non html traffic even if it is on http.
So what is my chance to make it work?

I have also read that skype uses a more sophisticated machanism.
Is it because my idea does not work or because their idea is faster?

I can compromise on speed now – which approach works and easy to implement?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I know you’d like to do it with TCP/HTTP,
    but the way I’d do it is use UDP to
    NAT ‘hole punch’, thus establishing a UDP channel,
    and then use UDP packets sent over that
    channel as the signaling mechanism…

    These may (or may not) be useful or relevant:

    http://en.wikipedia.org/wiki/STUN
http://en.wikipedia.org/wiki/Hole_punching
http://en.wikipedia.org/wiki/UDP_hole_punching
http://en.wikipedia.org/wiki/TCP_hole_punching

    Also — if you really have to use HTTP, you could
    simply issue a new HTTP request every X seconds…

    HTTP Polling, if you will…

    • 0