HELP: "This site can't be reached" from cellular networks

It looks like you don't have Apache configured to listen over IPv6, while having AAAA records for your domain.

IPv4 looks exactly as you would expect:

$ dig A idealagent.com +short
45.79.211.196

$ curl -4 -sIL https://idealagent.com | grep HTTP
HTTP/1.1 200 OK

But IPv6 is failing to return a response:

$ dig AAAA idealagent.com +short
2001:4860:4802:32::15
2001:4860:4802:34::15
2001:4860:4802:36::15
2001:4860:4802:38::15

$ curl -6 -sIL https://idealagent.com | grep HTTP
$

You can confirm this by running:

$ netstat -tlpn

After running that, most likely, you will see "0.0.0.0:80" and '0.0.0.0:443" in the output, which is IPv4. If IPv6 is listening, there will be ":::80" and ":::443" listed in the "Local Addresses" column.

To get it working for those customers, you could either add the required "Listen" arguments to your Apache config for IPv6[1] and restart Apache, or remove your AAAA records and not advertise IPv6 for that domain.

[1] https://httpd.apache.org/docs/2.4/bind.html

Thank you very sjacobs! That was it exactly! Very much appreciated!

Hello, sjacobs. I am having a similar issue to bladerunner1974. I have removed the AAAA records. Do you know how else I can not advertise IPv6 for my domain? It has been about 24 hours and the '$ dig AAAA example.com +short' command is still returning my IPV6.

It can take up to 48 hours for DNS changes to propagate to you.

-- sw