By breaks, I mean that if Web Shield is running, any program that's using it can't connect, unless I manually set the proxy. And no, ashWebSv.exe is not blocked, but I had to manually create all corresponding rules, as Comodo didn't even notice it's running. I have allowed DNS and loopback in Defense+ and all IP in/out connections in the firewall, but it doesn't work even if I set both firewall and defense+ to Allow all. It looks like some LSP conflict or something, I will try reinstalling avast as soon I have enough time. BTW, I have XP Pro and on Comodo forums there are lots of people with the same problem, it's also in the workarounds thread for current version.