Unless we are talking about AIS, the only potential relation between the problem and this subforum is avastsvc.exe in your firewall.
Bittorrent needs to be allowed in your firewall (and I think there is such a setting in Bittorrent that takes care of the built in Windows firewall automatically, but you may need to save the setting, exit bittorrent and reboot to make it work).
Are you having connection problems with any other software (like web browsers or avast)?