Do you experience problems with HTTPS (secure) webpage like certificate warnings, inability to login to your service or other secure HTTPS website connectivity issues?
Does disabling...
Main avast! menu -> Settings -> Active Protection -> Web Shield "Customize button" -> Enable HTTPS scanning (uncheck this option)
...make the problematic webpage operational again? Please post the web address to the problematic webpage in question down below, so avast! team will be able to look into it and fix it.
Please also describe in detail what exactly doesn't work, so the problem can be resolved faster.
Thanks