I have reassigned one subdomain of my main domain to my private server at home.
In the past i had an IPV4 IP address for this machine which A record was updated with a dyndns service from the hoster.
Now i moved to a new ISP at home and i am now having only an IPV6 addresss which is reachable from outside. (Dual-Stack). This ip address changes from time to time. I am using a dyndns service provider (dynv6.net) to get a “dyndns domain” because my hoster does not provide this service for IPV6.
To access my home server i am not using the “dyndns domain” from dynv6.net, i am using a subdomain of my “real domain”.
To reassign the subdomain to my home server i am using the “dyndns domain”:
My dynv6.net domain i linked to my subdomain with an CNAME entry at the DNS.
Past: A Record linked to a reachable IPV4
Now: CNAME record to a domain of dynv6.net (which is linked to my reachable IPV6 address)
certbot is giving me the error “SERVFAIL looking up CAA” when i want to renew or create a certificate for my regular subdomain.
If i create/renew certificated directly for my dynv6.net domain i have no problems.
Who should i contact to fix the DNS problem? The Hoster of my domain? Or is it a problem i did with the DNS config (CNAME)?
Thanks for your advise!