DNS Record
How to create the required CNAME DNS record for domain ownership verification
To use our ACME server you will need to set up a CNAME record for the domains you plan to order certificates for. This record is used to verify domain ownership and helps us speed up the certificate issuance process. This record only needs to be set once on the root domain of the domain you are ordering a certificate for. The destination (or value) of the record is identical for every domain, depending on the credentials you are using (individual credentials have their own unique record). This also means that the server you use for requesting your certificates does not have to be public facing!
Retrieve the DNS record value
In the previous steps you generated your ACME credentials. When your credentials were created a unique DNS record was also created for you. Navigate to the ACME automation page once more, go to the Credentials tab and copy the DNS record value (if you haven't stored it already):
In this example the record points to 4b121cd89407a55a7b26e377ca2dd92f.n4all.eu, yours will be different but similar, copy it.
Create the record
At your DNS server/DNS provider create a CNAME record _dnsauth that points to the destination you just copied.
When using a control panel this usually means going to the domain you want to create the record for, creating a new record of type CNAME,
and then entering _dnsauth as the name and your-code-here.n4all.eu as the value.
It may take a few minutes before the record is processed.