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