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aggi
My Android:
Settings > Network and Internet > Private DNSis set toAndroid-12345a.dns.nextdns.iowhere12345ais your account identifier, andAndroid-is a prefix that means all logs and analytics in NextDNS will identify that the DNS request came fromAndroid.That's it... and it works.
When doesn't it work? Or... when does it say "Private DNS server cannot be accessed"?
Occasionally this happens, typically it's either a very poor signal somewhere and in effect the internet cannot be access but it's these initial DNS calls that timeout so it misreports the root cause.
Or it's a captive hotspot, a public WiFi, with a very restrictive firewall configuration. And until you have got past their login screen the firewall is preventing all other connections. So again... root cause it misreported - if I must use this hotspot I disable the private DNS momentarily, login, and then re-enable.