I have avast! antivirus on my computer and also on our office pcs at web design company and I am wondering if it possible to configure a list to allow my Nintendo Wifi USB connector to connect to the internet. I have searched Avast! and have found nothing. I am using Avast! 4 by the way.
Hello, and Welcome to the forum 
I don’t think that Avast shold block this device however if you have any firewall …
Al968
its your firewall mate what firewall do you use?
avast! scans it doesn’t block. Blocking is the job of your firewall and/or router.
Please check either or both of these and make sure that you allow avast! in your firewall.
Welcome to the forum.