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by buckminster 2850 days ago
I can't share the domain name but its DNS servers are:

  ns3.cisws.nl
  ns6.cis-websolutions.nl
1 comments
mnordhoff 2850 days ago
Sharing the domain is usually critical.

Picking a random domain hosted on those nameservers, mdfs.net, it looks like, of the 4 IPs, 2 are down and 1 of the remaining ones doesn't support TCP.

http://dnsviz.net/d/mdfs.net/W48OcQ/dnssec/ https://ednscomp.isc.org/ednscomp/4040283963

1.1.1.1 is less tolerant than some resolvers of that level of breakage.

https://community.cloudflare.com/t/ipv6-timeouts-appear-to-b...

link
buckminster 2850 days ago
Thanks for having a look. If I understand that correctly the DNS servers are returning IPv6 addresses for themselves, which aren't functioning. So he needs to get his host to stop returning the IPv6 addresses (or to fix IPv6).
link
mnordhoff 2850 days ago
Yup. And also one of the IPv4 IPs isn't doing TCP.

I'm not sure nothing else is wrong, but the IPv6 issue is likely why 1.1.1.1 is having trouble resolving it.

link