Based on your last reply it seems that there is no problem with SSL certificate too.
But anyway, could it be the reason for Avast to block my website if there will be any problem with SSL Certificate ?
What may be the problem (at least I think this way) the problem was with the domain name service provider (DNS provider) it was the freedns.afraid.org by now I have changed it to the Amazon Route 53.
As I can see the problem is with domain name (DNS entry) not the IP as I’m able to open the page with direct ip but can’t access it with the domain name.
So yet another question is what is the frequency of avast review of the blacklisted domain names and/or IP addresses ?