[dns-operations] issue with wiki.mozilla.org

[A. Schulze]

Hello,

I get answers from 8.8.8.8 and 1.1.1.1 but 9.9.9.9 and my own systems  
return servfail.
http://dnsviz.net/d/wiki.mozilla.org/dnssec/ doens't look like a clean  
setup ...

Andreas