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

Been having this issue for a few days now. Here is how it goes:

  1. I connect to Wifi with Private DNS set to off.

  2. I change Private DNS to dns.adguard-dns.com

  3. I get error "Private DNS server cannot be accessed".

  4. Wifi is connected but no internet.

  5. Sometimes, it connects, goes through and works for a few minutes. Then it just hangs and no internet. No DNS errors.

  6. I disable Private DNS. Internet starts working again. I try to set Private DNS to Adguard and I start back at #3.

  7. When I set to NextDNS, zero issues.

Device: S23U unlocked with OneUI6.1

When I check the Adguard DNS status page, when internet works, I sometimes get an Orlando server and sometimes another server with chi in it. When it doesn't, I cannot get webpage to load.

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

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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 am just following what Adguard recommends here https://adguard-dns.io/en/public-dns.html (Method 2).

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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. 

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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. :/

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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 → Network & internet → Advanced → Private DNS.

  2. Select the Private DNS provider hostname option.

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