A test authorization for sgrdgw.gerp.work to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
153.254.112.181: Fetching http://sgrdgw.gerp.work/.well-known/acme-challenge/VrYTO0zIdE_D6z0AsJnQ4eiBq5x5o7esVkYlgPtsBVw: Timeout during connect (likely firewall problem)