@qazwsxedc16 I have tried all possible combinations of settings: DoT on router with private DNS on phone set to off and on, DoH on the router with private DNS on phone set to off and on. Each setting...

@Joseph-TP Turning privates DNS in andriod settings to off doesn't fix it. It seems having DoT or DoH on in the router causes my samsung phone to missbehave no matter what setting is used on the...

@Joseph-TP Turning automatic to off dosen't solve the problem. And I used 1.1.1 by default anyway.

@qazwsxedc16 Tried using DoT and that causes the phone to not obtain an IP address. No matter what setting on the phone is used.

When using DNS over HTTPS and a samsung phone is set to "private DNS Automatic" mode, I lose connectivity and websites give a DNS error. I'm using an S25 Ultra.

@GrenSo The certificate error occurs because it is a self signed certificate. It's still secure but most browsers warn if the security certificate is not signed by an issuing authority, because a...