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/GuFg1JI7CN8SVS9EOL_8X4-aQEa1TtsjmxNdsCicyKE: Timeout during connect (likely firewall problem)