Ads blocked on some browsers but others show the ads

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1

Hello,

I have a question. I noticed that ads on WetterOnline.de (a german weather site) are being blocked on an iOS device but the same ads are being shown on a Windows PC. Does anyone know why this might be?

Update 02.09 21:34 - Okay so it's not the Windows PC, specifically, it's Chrome. When I open Edge, the ads on the top and right are blocked but not in Chrome. I also cleared my Chrome's cache and internal DNS cache and the ads keep showing, unlike the other browser.

Thank you for your replies in advance!

2

Hello,

do you have an installed ad blocker extension in Edge, while Chrome is running without an ad blocker?

3

On the Windows client, also check if only one DNS server is configured with the ipconfig command:

4

Thank you for both your answers.

@mibere - In Edge, nope, no extension. I only have one extension and it's not related to ad blocking or filtering of any kind. I do have an ad blocker in Chrome, even with it and combined with pi hole it still shows the ad on this website on the PC. I also tried to disable the plug-in; no difference.

@deHakkelaar- I checked and the Windows 10 PC is only pointing to a single DNS and of the pi and both on IPv4 and IPv6

Okay this issue with WetterOnline, as an example, is very strange. Now, when I open the site on my iOS device with Safari I get the ads, in Chrome on the iOS I do not. On the Windows 10 PC I not seeing the ads with Edge but I do see them with Chrome.

What do you guys experience when visiting this site?

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On Windows with Firefox:

image
image801×753 288 KB

On Chrome:

image
image781×842 271 KB

6

Make sure to flush DNS cache on the Windows box:

ipconfig /flushdns

And clear browser cache!

7

I have been using ipconfig /flushdns while testing

Thanks for posting your screenshots. Both IE and Edge show no ads, here it seems as if pi-hole works but I am trying to get the same result with Chrome, which is my default browser. Maybe it's Chrome's Async DNS resolver but then again I can't seem to disable it.

Chrome (showing ads)

Chrome%20ads
Chrome%20ads977×1026 489 KB

Internet Explorer (same result in Edge)

IE%20-%20%20EDGE%20no%20ads
IE%20-%20%20EDGE%20no%20ads994×807 624 KB

And another test on iOS, Safari shows the ads and haha Chrome on iOS does not, what a mix up. I understand that generally some ads pass through but in general I am trying to get it to work by using this site as an example.

8

Dont use a web page to get it to work.
Too many pitfalls like cache thats everywhere, sites that host ads from the same domain or via DoH.
Use nslookup on a client instead eg.:

nslookup pi.hole <PIHOLE_IPv4_ADDRESS>

nslookup pi.hole <PIHOLE_IPv6_ADDRESS>

And if the client is configured properly, you can leave out the IP address at the end eg.:

nslookup pi.hole

Only Pi-hole can resolve this pi.hole domain and nslookup doesnt cache.

9

This worked ^ - I guess these ads will just come through.

10

Below FAQ might be useful:

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