The same problem.
As StephenOn3rdRock wrote in ad2

I found nothing in BCU forumfor this.

Last record in Avast-Browser-Cleanup.log:
Error 12029 has occurred.
Server Warning:

My system:
Win7x64 SP1
Commodo Firewall
Avast 2015.10.2.2215

This happens even when the firewall is turned off.
Avast want to download some rules from internet but can’t.