A test authorization for farm.adventblocks.cc to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
91.244.197.115: Fetching http://farm.adventblocks.cc/.well-known/acme-challenge/L-JHa2yvZqKebgDPERylf38Igqm3eep0muViAmwvkEM: Timeout during connect (likely firewall problem)