How to debug when DNS66 isn't blocking ads and other common pitfalls

DNS66 isn't blocking any ads

How to test

Go to "Hosts" tap on the "+", select Action "Deny" and add "www.example.org", Confirm, type the refresh button. Now check whether you can still enter "www.example.org" in your browser.

Or visit ads-blocker.com/testing and check whether you're seeing ads (if you're sure that your activated ad lists should block them).

Does it only happen in Google Chrome?

Open chrome://flags in Chrome and disable Async DNS resolver & Secure DNS lookups.

Does it only happen on WiFi but works on cellular connection?

Help fixing this issue by providing information on issue 239.

I have Android 10 or newer

Go to Settings > Network & Internet > Advanced > Private DNS Set it to Off. You can also try Automatic in case it's still not working but usually users had problems when Private DNS was not set to Off.

Nothing helped

In that case consider searching for a similar issue (even in the closed ones!). Try similar phrases as well. Consider opening a new issue if you didn't find anything helpful. Don't forget to add a DNS66 log file (in DNS66: touch the three dots and Logcat)!