Distant Access without changing network configuration ( VNC without port openning )

I looking for a solution for have the same functionality as a VNC. But i can't change the network configuration, it must work without any interaction of the user ( except fill the parameter of a script and launching it )

The Box will have a internet acces, but we have to consider that all the port except 80. The box will running a linux of our choice. We own the box, and we can install what we want on it. But we ship it by mail, and then some no technical people receive it. - They dont have to open any port - or changing any config

Any idea / input ? ==>

• not free web based solution like gotomypc, logmein ... ?
• kaboodleproxy for hosting a echoserver ?
• EchoVNC http://echovnc.sourceforge.net/fom-serve/cache/1.html

Thanks

Would a REVERSE VNC solution such as "UltraVNC SC" work for you?

We use it here all the time for technical support.

The client downloads a small .EXE (which DOES NOT install on the system) and simply clicks on the link of the person they want to connect to. We use ports 80 and 443 (and others) all the time.

As an added bonus, the client is brandable. Works VERY well for us.

Note:

This particular solution is Widnows Based.

UPDATE:

Since the Windows solution isn't a viable option for you my next recommendation would be a reverse SSH tunnel. You can find instructions for how to do this all over the place but check this link out first:

http://www.howtoforge.com/reverse-ssh-tunneling

Can you install any sort of vpn software such as openvpn or hamachi? If so just have the computer you are on connect to the vpn the vnc computer is on and connect to its vpn ip with your vnc viewer.

www.logmein.com works on port 443 and does it outbound from the server so you don't need to open anything up on the firewall. If you can access an SSL site, then you can use this.

Works very well and they have a free version. I use it for all my remote access now.