A test authorization for www.tech-check.ch to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://www.tech-check.ch/.well-known/acme-challenge/aEDy3A9-Xg6Sas4Q8A4K1hzkdTRaFEJmqwMz-js14Ms: Connection refused