Expected Behaviour: Running bare metal version 6 on Raspbian (Bullseye). Noticed the DNS service being very unstable and dropping every so often. Looking at the admin webui there was an errors: Connection error (208.67.222.222#53): TCP connection failed (Operation in progress) Connection error (…

Have you tried different upstream DNS servers with Pi-hole to see if that resolves the problem? V6 uses a new dnsmasq version that can send DNS queries in mixed case, and some upstream servers object to that.

Thanks for your suggestion. Should mixed cases be an issue, there should be entries in the Pihole log files with mentioning "Case mismatch". Doing a grep of all files pihole.* and FTL.* looking with -i "case" I found 0 entries back. So, no, this doesn't seem to be the issue.

I'm seeing the same issue - CONNECTION_ERROR TCP connection failed (Operation in progress)

[image] Wiggum127: this doesn't seem to be the issue. Did you try using different upstream DNS servers?

Pi-hole Userspace

Dnsmasq[2757]: reply error is SERVFAIL

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