Let's Debug

Test result for dkaraus.ch using http-01

A fatal issue occurred during the DNS lookup process for dkaraus.ch/CAA.
DNS response for dkaraus.ch/CAA did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for dkaraus.ch/A.
DNS response for dkaraus.ch/A did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for dkaraus.ch/AAAA.
DNS response for dkaraus.ch/AAAA did not have an acceptable response code: SERVFAIL
Fatal
No valid A or AAAA records could be ultimately resolved for dkaraus.ch. This means that Let's Encrypt would not be able to to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.

Submitted Sep 18 09:04:29 2019. Sat in queue for 2ms. Completed in 2s. Show verbose information.