system
12
I am much the same, the only time I had issues with the firewall was when I first updated and the control centre was telling me that it and the av were switched off (which was fixed by using the multiple reboots, the whole time the services and avast itself said they were switched on). But I’m running the same settings as I did with 8 and both firewalls are working side by side as before, even though it says avast is in control of the firewall it’s not felt the need to switch it off.