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Constant "Private DNS server cannot be accessed" and internet drops

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It’s your network constantly blocking DOT or the port used by AdGuard DNS. Try using DOH.

I am using the public Adguard DNS via the inbuilt Private DNS setting in Android https://adguard-dns.io/en/public-dns.html configured via method #2. Do I need to download Adguard app to change to DOH?

Also, is there any reason network blocks only Adguard but not OpenDNS (both configured using same methods)?

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how does Private DNS change from a domain name to an IP address does it not need a DNS server to do that? I think that is where the problem is. you can try the plain IP address numbers.

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I'm having the same issue with my phone. The ad blocker appears to be working, but I keep getting the same message saying it's not working. 

same issue here. Been a constant pain for months. I guess I'll try OpenDNS like the OP, and see if it's better. Bummer, since I really like Adguard, and was planning to buy a lifetime sub. :/

I was having the same issues on Google Pixel 9. After reading this Reddit, I switched from AdGuard DNS to Next DNS, and the Internet (both on Mobile Data and WiFi) is working now.

  1. Go to Settings β†’ Network & internet β†’ Advanced β†’ Private DNS.

  2. Select the Private DNS provider hostname option.

  3. Enter c9ca5b.dns.nextdns.io and hit Save.