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This is the one network setting most people never think of when they have problems

There are several ways to troubleshoot the DNS on your network or device. First, try pinging a domain with its IP address.

How to turn on Private DNS Mode on Android - and why you should do it ASAP

You'll find the entry for Private DNS near the bottom of the Network & internet window. On Galaxy devices, it will be located in the middle of the More Connection Settings list. If you don't find it, ...