A test authorization for cerb00apps.onesoft.es to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
185.31.23.208: Fetching http://cerb00apps.onesoft.es/.well-known/acme-challenge/Scsw5onXlEX-TMlsO62L6INzLywgnIcwDimXSqlZKFI: Timeout during connect (likely firewall problem)