While trying to activate Let’s Encrypt for an hostname, we are getting the error below:
2017/07/27 02:25:42 http: TLS handshake error from 18.104.22.168:8255: [stats.coolcalc.com] failed to get certificate: acme: Error 400 - urn:acme:error:connecti
on - DNS problem: SERVFAIL looking up CAA for stats.coolcalc.com
Validation for stats.coolcalc.com:443
When searched this forum, I see that this error is expected if the DNS to the hostname is not resolved. Yet, the response above states that it resolves. And, I can’t see any issues when checked with http://intodns.com/coolcalc.com .
I would love to get your help on clarifying the reason behind the issue. Thanks so much,