# Ads not blocked on some clients

**URL:** <https://discourse.pi-hole.net/t/ads-not-blocked-on-some-clients/31695>\
**Category:** Help\
**Created:** [May 7, 2020, 11:29am UTC](https://discourse.pi-hole.net/t/ads-not-blocked-on-some-clients/31695 "2020-05-07T11:29:39Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![deHakkelaar](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/dehakkelaar/32/674_2.png) [@deHakkelaar](https://discourse.pi-hole.net/u/deHakkelaar)\
**Post date:** [May 9, 2020, 12:17am UTC](https://discourse.pi-hole.net/t/ads-not-blocked-on-some-clients/31695/14 "2020-05-09T00:17:49Z")

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Maybe ads are leaking through the IPv6 DNS server(s) configured on the Win client:

`netsh interface ipv4 show dnsservers`

`netsh interface ipv6 show dnsservers`

Or the DNS answers coming from the DNS server(s) might be malformed/protected by some AV software:

> [@Literally no ads being blocked](https://discourse.pi-hole.net/t/literally-no-ads-being-blocked/31600/36):
>
> That Windows machine you are using wouldn't run a virus scanner like AVAST? AVAST offers a feature called RealSite that will inject additional DNS queries to a "trusted" DNS server (run by AVAST) in case something goes wrong with normal DNS resolution, see [https://discourse.pi-hole.net/t/hilfe-windows-lost-hostname-auch-ohne-pihole-auf/27892/26](https://discourse.pi-hole.net/t/hilfe-windows-lost-hostname-auch-ohne-pihole-auf/27892/26) (though German, it also contains a short solution description in English).

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