If your internet isn't working on CV4A and the page has the ERR_NAME_NOT_RESOLVED error on the page you can usually solve this issue by following these steps.
CV4A Settings
Go to CV4A Settings Privacy and security Use secure DNS turn off the switch to use secure DNS.
Samsung - Device Settings
The path to the settings on Samsungs should be similar to this.
Go to Settings Connections More connections settings Private DNS Turn off the switch to use Private DNS.
Device Settings
Most device types will have a path in settings similar to this.
Go to Settings Network & Internet Private DNS Turn Private DNS off.