I get this identical problem as well, and I also have talked to a lot of you on IRC. Win2k/WinXP I dont think the OS is the problem. I get the exact same problem on my WinXP box, W98 box, and Linux box. 3 different os's, exact same problem. No firewalls, no routers, etc etc etc.
Hogie offered the idea that my ISP (Charter Communications) has codee in place to prevent the use of servers on residential accounts. I have researched this with mixed success. Telnet server on my linux box works fine. FTP server on any box works fine, just gotta turn off passive transfers, and it cant be on port 21. The FTP issue i wrestled with for a long time before I found out charter blocks port 21 TCP servers. But why would they block UDP port 9000? I am not totally convinced its Charter on this one, and since im not alone i am looking for another reason.
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