Connection error has been happening for a while; need assistance.

Help
1

Please follow the below template, it will help us to help you!

Expected Behaviour:

As far as I know, all the connections should be made, but a connection error consistently comes up.

  • Ubuntu 22.04.5 LTX x86_64
  • Hardware IdeaCenter Q190
  • Docker compose file: N/A
  • Docker engine version: N/A

Actual Behaviour:

Connection error (2620:119:35::35#53): failed to send UDP request (Network unreachable)

Debug Token:

Debug token provided from running pihole -dis as follows:

https://tricorder.pi-hole.net/p2qHKtX7

Any help would be appreciated. Thank you.

2

Your debug log indicates your home network has link-local IPv6 connectivity only:

*** [ DIAGNOSING ]: Name resolution (IPv6) using a random blocked domain and a known ad-serving domain
[✓] free-lesbian-dating.com is NOERROR on lo (::1)
[✓] No IPv6 address available on enp4s0
[✓] free-lesbian-dating.com is NOERROR on wlp3s0 (fe80::<redacted>%wlp3s0)
[✗] Failed to resolve doubleclick.com via a remote, public DNS server (2001:4860:4860::8888)

Without public IPv6 connectivity, your network can't reach public IPv6 DNS addresses, including those of OpenDNS, and whenever Pi-hole tries to contact them, that would result in:

It's easy to avoid those messages:
Just untick OpendDNS IPv6 from your Pi-hole's Upstream DNS Servers.

Unrelated to your issue, I noticed that you are using several regex filtering rules like:

https?://([A-Za-z0-9.-]*\.)?s\.yimg\.com/cv/ae/us/audience/

That won't do anything, as it's trying to match a URL, and Pi-hole only ever sees domains.
If e.g. a browser accesses https://discourse.pi-hole.net/t/connection-error-has-been-happening-for-a-while-need-assistance/85053?u=swmom, it would send a query for the domain part to Pi-hole, i.e. just discourse.pi-hole.net.

You should rework those rules accordingly.

You also have a few thousand exact match rules for domains similar to r1---sn-25ge7n76.googlevideo.com.
If those would have been created by a third-party tool in an attempt to block ads on youtube, you should be aware that we've seen reports where Pi-hole experience was negatively impacted, as those tools may constantly stop and restart Pi-hole in short succession, in order to add new match rules.

3

Thank you, I will get in there to modify those things you mentioned. I'll report back on how it goes. Much appreciate your time!!