Hi, I had this same error message when I tested my utorrent. I have Windows XP and didn't see where to enable "data sources across domains" I went into my wireless router administration page and turned off my router firewall and things worked great after that. I have Zonealarm for my firewall and that is sufficient for me. I have a Belkin router. My steps to fix this were to paste http://192.168.2.1/ into my internet browser type in the username and password, click on firewall, then select disable.