[dns-operations] Oddness with Cloudfare authoritative servers

[Peter van Dijk]

On Thu, 2021-09-23 at 14:35 -0400, Warren Kumari wrote:
> Whatever the case, the fact that William was experiencing issues when this particular address was returned, and it seems to be the only one that responds in this way when no SNI is provided is, um, interesting.

As far as I have seen, in the past and recently and today, all
Cloudflare properties respond like this when no SNI is provided.

>  Perhaps whatever his customer was using isn't a web browser, or is really old, or (being part of a school system) passes through some sort of interception proxy which doesn't interact well, or...

To me William's problem is still entirely unexplained, unless the 172/8
theory fits!

Kind regards,
-- 
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/