i have a very similar problem with using all file sharing programs including xolox. I can get search results, but can't initiate any real downloading. I go to university and am on a residence network. I've asked our tech support a lot about them blocking certain ports for file sharing and they are very sketchy for a real answer. I can run a Shoutcast streaming radio station that works great inside the network, but people outside can't even get the stream. Is there a program that analyses the connection, so you can tell xolox to work in a different way?

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