Connecting to device behind firewall

Using wpf: Connecting to device behind firewall on newest questions tagged wpf – Stack Overflow

I have a wpf app that needs to communicate(exchange data) with a custom designed device (we can modify the code for the device). Do I have any options to connect to the device if it is behind a firewall via http? I was hoping there would be a method where the admin would not have to forward any specific ports or do anything on his end. I assume the issue is how would I address the device from my app. I know SOAP over SMTP is one option. Is another option where the device could chatter out to my application via http?

source: http://stackoverflow.com/questions/2529941/connecting-to-device-behind-firewall
Using wpf: using-wpf