Do you know how teamviewer make the client to cliente comunication whithout open ports?

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I have a program that use the server/client arquitecture, but if I want to use the program over Internet, I face with the open ports problem.

¿How Teamviewer resolve this problem? ¿How don´t need open ports?

Thanks

Posted 19-May-12 16:54pm

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Shahin Khorshidnia 20-May-12 2:28am

What to do with C#?

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**Zoltán Zörgő** · Answer 1 · 2012-05-20T01:20:00

Use a sniffer like Microsoft Network Monitor or Whireshark or even ProcessExplorer will do it. You will see, that it is contacting a server, to find a party, like Skype, or many other tools. The server is not used for the actual data exchange, only for handshake - or they use gateways placed around the world. Thus you have two "clients" communicating. This is a mixed client-server party-to-party architecture. Well it is a little bit more complicated if you want to make your own "routing", but this is the idea. Many of these tools are also using UPNP for example and try to open ports if possible.

But this is not an actual programming question...