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All remote desktop software that I know about needs to modify firewall settings and open ports.

How can Teamviewer work without modifying them? Does some alternative software exist that can also do remote control without modifying network settings?

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"And, does exists some alternative software who"?? Please clarify that last line. –  Kyle Mar 17 '11 at 16:18
    
I think OP is looking for alternatives to Teamviewer which can do the same thing. –  Lekensteyn Mar 17 '11 at 16:24
    
There are a lot of alternatives which use a server to set up the connection, so do not need open ports for incoming connections. I use Citrix GoToAssist. CrossLoop is another one. –  paradroid Mar 17 '11 at 17:14

1 Answer 1

up vote 12 down vote accepted

TeamViewer on the remote PC maintains an idle connection to the TeamViewer proxy servers and waits for a connection request. After receiving it, a direct UDP connection can be set up; see UDP hole punching.

Also try pwnat.

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