Don't know how Comodo is configured for local proxies these days, but all the connections generated when you use Avast are visible in OA, TCPview, etc. One is a set of localhost connections between your browser and avastsvc at 127.0.0.1:12080 . The other is a set of connections from avastsvc to the actual internet IP addresses. So, for example, if you want to block an IP address, you should be able to block it for avastsvc instead of your browser. What are you trying to do?