DNS over HTTPS to IPv6 not responding

Website, Application, Performance DNS & Network
1

Using cloudflared ARM64 (2024.2.1 and 2024.3.0). All DNS queries wait 5 msec on each IPv6 server before falling back to IPv4 servers. I have routable IPv6 on my machines. This issue started around 02.00 CET on 2024-03-21
systemctl status cloudflared returns:

  • cloudflared.service - cloudflared DNS over HTTPS proxy
    Loaded: loaded (/etc/systemd/system/cloudflared.service; enabled; vendor preset: enabled)
    Active: active (running) since Fri 2024-03-22 06:30:01 CET; 17h ago
    Main PID: 550 (cloudflared)
    Tasks: 12 (limit: 1599)
    CPU: 48.287s
    CGroup: /system.slice/cloudflared.service
    `-550 /usr/local/bin/cloudflared proxy-dns --port 5053 --upstream https://[2606:4700:4700::1112]/dns-query --upstream https://[2606:4700:4700::1002]/dns-query --upstream https://1.1.1.2/dns-query --upstream https://1.0.0.2/dns-query

Mar 22 06:59:36 pi-hole cloudflared[550]: 2024-03-22T05:59:36Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:37 pi-hole cloudflared[550]: 2024-03-22T05:59:37Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1112]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1112]/dns-query": context deadline exceeded (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:37 pi-hole cloudflared[550]: 2024-03-22T05:59:37Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1112]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1112]/dns-query": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:37 pi-hole cloudflared[550]: 2024-03-22T05:59:37Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": context deadline exceeded”
Mar 22 06:59:37 pi-hole cloudflared[550]: 2024-03-22T05:59:37Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:37 pi-hole cloudflared[550]: 2024-03-22T05:59:37Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": context deadline exceeded”
Mar 22 06:59:39 pi-hole cloudflared[550]: 2024-03-22T05:59:39Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:39 pi-hole cloudflared[550]: 2024-03-22T05:59:39Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:42 pi-hole cloudflared[550]: 2024-03-22T05:59:42Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)”
Mar 22 06:59:42 pi-hole cloudflared[550]: 2024-03-22T05:59:42Z ERR failed to connect to an HTTPS backend “https://[2606:4700:4700::1002]/dns-query” error=“failed to perform an HTTPS request: Post "https://[2606:4700:4700::1002]/dns-query": context deadline exceeded”

2

Please post the output of

https://ipv6.icanhazip.com/

3 Likes
3

You’re right. I can’t get there any more. My ISP gives my router an IPv6 range, but doesn’t route IPv6.
On their website they say they completed a major upgrade to their core network around the time that IPv6 DNS stopped working. I’ll contact them. Thanks for the tip.

1 Like
4

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