To operator of bitcoinfees.cash: please check on technical issues

The site seems to be having technical issues unfortunately. It used to load perfectly and without any hassle for me before.

Now, first my browser complained that its certificate was not valid for the site, then when I accepted to continue, I got:

"The firewall on this server is blocking your connection."

p.s. thanks for the site, it has been very useful, I'm sure not only to me but to many others as well.