Those with AT&T ensure you turn off Active Armor

For those that have AT&T/AT&T Fiber…. and you are having issues connecting ensure you TURN OFF Active Armor
(as it will block sites causing issues with your connection)
Deactivate ActiveArmor and remove the service
1. Go to Settings in ActiveArmor mobile security.
2. Tap Account and choose Remove Service.
3. Choose one of the following:
• On your iPhone – confirm that you want to remove AT&T ActiveArmor mobile security.
• On an Android phone – select AT&T ActiveArmor mobile security.
4. Tap Remove to finish up.

Information found here:

https://www.att.com/support/article/wireless/KM1252909/