Ummm...
Microsoft connects to the net all the time.....
You gonna block it? Hmmm?
Avast is suppose to have access to the net. That is
one way it keeps you SAFE. The only reason I can see
to not allow a TRIAL piece of software, (if I read your post correctly),
such as Avast an internet connection is to try and keep the trial fully functional
past whatever time limit is set.
If you do NOT trust the security software, then what good is it?
Then again, what good is the OS you are using?
You connected to this post..right?