There is no way I would consider turning off or suspending Outpost, certainly not for any youtube videos.

There are some firewalls when you disable it then it actually blocks outbound connections. Whilst I don’t believe that is the way with Outpost, I really can’t see the circumstances when you would want to suspend or turn off your firewall.

So I’m not sure how you think avast is somehow involved, if the firewall when suspended blocked avastsvc.exe then no connections would work and not just youtube.