I have just noticed in Log Viewer that there is one item that is blocked on every bootup.
It is outgoing, has a different Destination IP each time and has a Destination DNS of something like a692sm.avast.com. The 692sm part changes each time. It is blocked by the rule ExtBlockAll2, whatever that is.

I am using Windows 7.

Can anyone tell me what this item is and what should be done about it?