A test authorization for janvanoorschot.nl to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
178.250.146.51: Fetching http://janvanoorschot.nl/.well-known/acme-challenge/m-35Ba-X2BN7pUY11YAgs62k_uyLCFxA_4rPiCeaQyA: Timeout during connect (likely firewall problem)