Server cannot resolve my domain name?

I’ve had LE certificates for over a year now, so this isn’t a new certificate problem. I get the error when running certbot renew:

FailedChallenges: Failed authorization procedure. (http-01): urn:acme:error:unknownHost :: The server could not resolve a domain name :: No valid IP addresses found for

I have double-checked that my nameserver has * set to an IP address (, and that it’s resolvable via dig and curl on my end. The DNS entry hasn’t changed in months, so it shouldn’t be a propagation problem. Anything I can do? Or should I just wait and see if it works later?

* may resolve to an IP.
But “” doesn’t resolve to any IP.

My fault; I was using * when I should have been using @ (for the domain without subdomains) in the DNS. Looks like the DNS got all screwed up.

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