Distributed C# Application under proxy network.

I have 2 LAN:
1. Machine A (winxp) in LAN 1. This computer has no direct connection to the internet, it must use a local proxy server PS at port number 81 with username/password to go to internet. There, we have Application 1
2. Machine B (win xp) in LAN 2. This computer has connection to internet thru a local gateway, that means it has no public ip. There, we have Application 2

The 2 LANs are connected thru internet.
My question is: How can these appications in C# can interact overnetwork? Is it possible?  If yes, then how?

If there are any unclear points, just ask me again.

Thank you a lot.
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rambovnAsked:
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johnaryanConnect With a Mentor Commented:
I see where you're coming from, but in order for a situation like this to work you'd have to configure both machines to be visible to the internet, and then provide a service that exposes the functionality of each to the outside world. This does require a good knowledge of your underlying architecture and hardware. The trouble here is the Proxy server and it's build in firewall is there to stop people doing what you're trying to do, so you'll need access to it to configure to allow unsolicited communication from the outside world.

From what I can see the easyiest solution (if you have permissions on the proxy server) is:
Machine A:
Create a Web Service/ WCF Service or remoting interface to the functionality you want to expose.
Use Port Forwaring (also knows as NAT Forwarding) on the proxy to allow internet traffic through to port 80 on Machine A

Machine B:
Create a Web Service/ WCF Service or remoting interface to the functionality you want to expose.
Use Port Forwaring on the local gateway (is it a router) to allow internet traffic through to port 80 on Machine B

Then configure both your apps to use the interface provided by the other.

John
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rambovnAuthor Commented:
Thank you. Do you have any other solution that requires less permission in the side of Machine A?

I wonders how Teamviewer works (http://www.teamviewer.com/index.aspx). It works fine with ours machines without port forwarding or any special permission.
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johnaryanCommented:
Afraid not, if Machine A's only access to the internet is through the proxy, then all incoming traffic will need to know where to find it (hence the port forwarding.) I don't know of any other way to let the outside world access to a machine on your LAN.
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