# My pi-hole isn't blocking ads!

**URL:** <https://discourse.pi-hole.net/t/my-pi-hole-isnt-blocking-ads/27450>\
**Category:** Help\
**Created:** [January 26, 2020, 4:09am UTC](https://discourse.pi-hole.net/t/my-pi-hole-isnt-blocking-ads/27450 "2020-01-26T04:09:38Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![jfb](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/jfb/32/4332_2.png) [@jfb](https://discourse.pi-hole.net/u/jfb)\
**Post date:** [January 27, 2020, 12:32am UTC](https://discourse.pi-hole.net/t/my-pi-hole-isnt-blocking-ads/27450/11 "2020-01-27T00:32:24Z")

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In this forum, you can paste text replies directly into the reply, and this helps us copy text for troubleshooting.

Note that in Resolver 1 in the second output, that there are two DNS servers available to the client. The first is Pi-Hole, and the other is Cloudflare. The client is free to move to either server, and I suspect it moved to Cloudflare for some period of time.

> [@Why should Pi-hole be my only DNS server?](https://discourse.pi-hole.net/t/why-should-pi-hole-be-my-only-dns-server/3376):
>
> Reduced Ad Blocking Capability The main reason you should Pi-hole as your only DNS server is that you will see increased performance in the blocking of ads. If you have two DNS servers (Pi-hole and something else), your network clients may not always query Pi-hole for name resolution. If a query happens to be answered from a non-Pi-hole DNS server, your block lists will not apply (since that DNS server doesn't know about them). All Queries Need To Go Through Pi-hole First Since other DNS serv…

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