A fatal issue occurred during the DNS lookup process for diskstation.eu/CAA.
DNS response for diskstation.eu/CAA did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for diskstation.eu/A.
DNS response for diskstation.eu/A did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for diskstation.eu/AAAA.
DNS response for diskstation.eu/AAAA did not have an acceptable response code: SERVFAIL
No valid A or AAAA records could be ultimately resolved for 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.