A test authorization for mirror.anarc.at to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://mirror.anarc.at/.well-known/acme-challenge/jMY4RGw1s6zCO0dWFUNaPKDc_P3N0F9SnvyGBZxcg6w: Timeout during connect (likely firewall problem)