Server send message "Detail: DNS problem: SERVFAIL looking up A for" when generate a Certificate

I can't generate a certificate using default process.
I am getting a message:

Failed authorization procedure. (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: SERVFAIL looking up A for

  • The following errors were reported by the server:

Type: connection
Detail: DNS problem: SERVFAIL looking up A for

I don't know what happened, because this domain is working fine
Please help!!!

The domain might be working fine, because appropriate DNS records are still cached by other DNS servers. For example, your domain resolves just fine using Google Public DNS. However, LE servers check your “authoritative” servers to get the records - in your case those are and And while NS4 seems to respond, the NS3 one times out. Once that is fixed by whoever is responsible for your DNS, the process should work.

Thanks so much for your response :heart_eyes:

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