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/aQt1-4G3_z8IAeZtcjqNRjZO1Gkr4fFsRzKfBQPehQw: Timeout during connect (likely firewall problem)