I was wondering which NS server is used by Let’s Encrypt to validate the DNS challenge.
I found several similar answers on the forum after some googling:
- DNS Servers used by LetsEncrypt for Challenges
- Which DNS server Letsencrypt use to verify the dns-01 challenge?
- TTL and DNS server used by Lets Encrypt
They all says the domain name NS server is directly use, so we should not have any propagation issue.
But I would like something more official than forums answer, and I’m surprised to found nothing about that on the documentation (or maybe I did a wrong search).
It would be great to add a section about this on this page: https://letsencrypt.org/docs/challenge-types/
What do you think?