„unable to resolve host“ when mobile and alternative DNS activated (not when wifi)

Where did you download Blokada from?

blokada.org, older versions (< v5.8) from apkmirror.com

Which device do you use? Do you use a custom ROM? Do you know which OS version you are using?

Pocophone F1, MIUI Global 12.0.3.0 (QEJMIXM) stable, Android Version 10 QKQ1.190828.002

Please explain the issue as detailed as possible . Also include patterns you observed (like ‘it only happens on wifi’). The more information the better.

Blokada is „unable to resolve host“ when mobile (provider: PennyMobil). On wifi everything is fine.

I tried blokada 5.8 and 5.6 also some v4.x Uninstall, reinstall, no solution.

I can solve the problem, when I do not use alternative DNS. When I use alternative DNS Server (no matter which one), the error occures.

The blocklists are not the problem.

Private DNS is turned off.

I tried the „always on mode“ on and off – no solution.

Since when are you facing this issue?

I guess 1 - 2 weeks

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Problem not solved yet.

I also tried to configure ‘selected network’ with ‘prefere network dns’, but this does not work. Still connected to alternative dns.

In the blocklists activity everthing looks fine, the imoortant things are not blocked.

Same problem with Blokada 5.10.1

I have the exact same problem after switching to a new provider. But I am not sure if that is the root of the problem, as on the first evening with my new provider it worked fine and from then on I also got the “not able to resolve” error in the browser and also no connection in some apps. Started 3 days ago.

My (german) provider is PennyMobil (Congstar / Telekom).

Now I tried a diffrent sim-card (sim.de / Telefonica) and the problems with the alternative DNS providers were gone. It worked correctly with no problems.

So I guess, that the problem is not Blokada because:

  • some problems with the Blokada alternative App “DNS66”
  • no problems with Blokada when using a diffrent provider

Same problem, unfortunately without a solution:
https://forum.fairphone.com/t/after-updating-to-android-10-no-more-alternative-dns-servers-nach-update-auf-android-10-keine-alternativen-dns-server-mehr/64456

So how to deal with that issue?

Anyone a good idea?

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