iOS Web page errors over Cellular Data but not over Wifi? Recent change to AT&T Cellular network?

Question

I\'m encountering an issue with certain iOS web pages (in both mobile Safari, Chrome, and in also iOS Webviews in app) over cellular data vs. Wifi,

The issue is iden

Answer 1

I had the issue and found that I configured IPv6 on DNS and FireWall but not on the server.

Removing IPv6 from DNS and everything works.

You can use https://ipv6-test.com/validate.php to test it.