I'm having a similar problem. I installed Service Pack 2 so I'd be on the same page as everyone else, even though ive been reading about it conflicting with shareaza. But it gave me a new insight into the problem: Every other internet program i run, Windows firewall asks me if I want to block it or not. But not for shareaza. So apparently it isn't even getting as far as my computer's own internal security, let alone my router or my ISP. It should also be noted that I have no problem sending or receiving data through any other applications. So I really doubt it has anything whatsoever to do with my router, my ISP, or even windows security.

Well hello lucky for you guys i have stumbled across this page i have the way what you have to do to fix this problem the only reason why i know is i had the same problem what you have to do is go into your control panel and click on internet firewall and then unclick the exception under firwall setting judt trun your firewall off for now then you have to click shareaza and check the box udp and put in there shareaza then under port you have to put 6346 make sure you do that twice for udp and the other one you shuld have 3 shareazas in your firewall execption when you all done well good luck your firewall thing should go away and dont forget to rebbot your after your done good bye

please let me know if this works?

Ozzie;;that fix didn't change anything here,,still have the firewall....getting very frustrated here.......

does anyone really know what their doing here,,or is it all abunch of people trying to pretend they know what they are doing,,,I have spent hours reading all these fixes and they generally don't work,,usually makes the problem worse. Might just have to start renting ****ing movies...less ****ing stress

All I can tell you is that after I once again checked my WinXP sp2 and mcaffee firewalls my problem disappeared.
I didn't actually change anything.
So I have no idea.

frizzer;;when you said you checked your xp service pak,,,what did you do to check it?,,and how can i check mine,,,thanks,,,,