Try restarting Avast service (or your computer, might be easier). Sometimes Avast remembers that this was blocked, so it cuts connection without complaining to the user - this is intended.
found something but may not be the correct answer,
there is a “secure DNS” option enabled in the Active protection if I disable this,
Avast doesn’t block the site.
so is it something to do with Avast DNS?
but i have set my DNS to google DNS (8,8,8,8 8,8,4,4) in my connections
I have no idea why using a different DNS server would provide different results, and if I can access the domain (using SecureDNS, therefore Avast’s DNS as well)…