Why does this website won't load when use with Pi-hole?

[CatLover32]

The issue I am facing:
Hello. So currently I am trying to visit a specific website but however the website won't load. I suspected it has something to do with the IPv6 return NODATA-IPv6 but the IPv4 does return a valid IP. As I research deeper about IPv6, apparently both A and AAAA queries can be resolved over IPv4 DNS. So I don't think that I didn't use any IPv6 DNS resolver should be an issue. So I am not quite sure what to do.

To visit this website I need to use another DNS resolver than my own Pi-Hole.

I did a nslookup test on my laptop and it does give the correct IP.

Tail pihole.log

Directly without going through Tailscale

Details about my system:
Pi-hole is hosted in a docker container and currently using Cloudflare DOH as the upstream resolver as port 53 is blocked. Using Docker image from this (GitHub - aazam476/pihole-doh: A docker made to install Pi-Hole and Cloudflared (for DoH).)

What I have changed since installing Pi-hole:
Just added a few adlists

[jfb]

From your outputs, it appears Pi-hole is correctly resolving the domain you have requested.

This would infer that the problem is outside of Pi-hole. But, you can use these tools to determine if Pi-hole is blocking any domains that are needed to access your desired content:

How do I determine what domain an ad is coming from?

Block ads or fix broken sites This FAQ is written in the context of finding out how to block an ad that isn't blocked automatically, but the same steps can be used to troubleshoot issues with sites that don't function properly. An example is that sometimes certain payment gateways try to collect metrics on the sale, but these domains are blocked by Pi-hole, so the payment cannot be processed. Also, some links send you through several referrers and if one of them is blocked, you may land on a …

[deHakkelaar]

@CatLover32

I suspected it has something to do with the IPv6 return NODATA-IPv6 but the IPv4 does return a valid IP. As I research deeper about IPv6, apparently both A and AAAA queries can be resolved over IPv4 DNS. So I don't think that I didn't use any IPv6 DNS resolver should be an issue.

Indeed a lot of sites dont have IPv6 AAAA DNS records:

$ nslookup -type=A elearning.unimap.edu.my
Server:         10.0.0.1
Address:        10.0.0.1#53

Non-authoritative answer:
Name:   elearning.unimap.edu.my
Address: 103.86.130.120

$ nslookup -type=AAAA elearning.unimap.edu.my
Server:         10.0.0.1
Address:        10.0.0.1#53

Non-authoritative answer:
*** Can't find elearning.unimap.edu.my: No answer

And domain names can be resolved to IPv4 addresses via IPv6 DNS and vice versa.

Have you tried on another device/OS?