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I have a Nextcloud running on a Raspberry Pi 4. My ISP: Vodafone (Germany) didn't give me a unique public IPv4 address, so I had to use my IPv6 instead to set an AAAA record for my domain (cloud.mydomain.de).

Then my nextcloud was accessible from other computers via cloud.mydomain.de But I was not able to access it from my mobile phone, both from Wifi or mobile network. After some online digging, I found that the DNS settings might be the reason for that, and I installed and app that can change my DNS settings. And changed my DNS to cloudflare. After doing this I was able to connect from my phone to nexcloud using Wifi, but not when using mobile network.

This is strange, because I checked and my mobile network has IPv6 enabled, also when checking with https://www.whatismyip.com/ I have an IPv6 address. Also, I checked using mobile network that I can connect to an IPv6 only website, like http://ipv6.google.com/ So, why can't I connect to my website using mobile networks?

Anyone experienced something similar? Any idea what I can check next?

Mihail-Cosmin Munteanu
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    Welcome to Android Enthusiasts. I have a feeling this was caused by ISP DNS hijacking. – Andrew T. Apr 09 '23 at 10:10
  • I would install Termux from FDroid and check using ´telnet´ (http) or ´openssl s_client -connect` and the public IPv6 address of your Raspi if IPv6 connection works correctly and you can reach the web server. If that works then a DNS problem is very likely. – Robert Apr 22 '23 at 12:48

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