Webshield blocks safe URL

Apparently, when Avast webshield detects something, it automatically blocks that website from ever being able to be accessed in the future, even if it’s safe??? When I try and access the Eicar test file download site, it won’t load. Well, a few other sites I use have the same problem. Is there a way to unblock those sites so they can be access??? It no longer brings up the detection pop up but in the browser it says:

The connection was reset

The connection to the server was reset while the page was loading.

hen I try and access the Eicar test file download site, it won't load.
You mean this? www.eicar.org/ or this? www.eicar.org/86-0-Intended-use.html
Well, a few other sites I use have the same problem. Is there a way to unblock those sites so they can be access???
First we need to know what sites?