If you use Shareaza, then you can use the Shareaza connection test to find the actual problem...
By the way (I was to lazy to read the entire threat), where do you want to run your application? Home network? Private LAN? Company network? Highschool internet connection?

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</td><td><a href="http://crawler.trillinux.org"><img align="right" style="border:0" src="http://crawler.trillinux.org/img/netsize.png" alt="Network size"></a></td></table>