- Home Assistant OS (on bare metal Intel N100, RAM 16GB, Ethernet 1Gbps)
- Core2026.9.3
- Supervisor2026.09.2
- Operating System18.3
For some time now, periodic errors have been constantly appearing in the main log:
026-09-20 14:52:32.634 homeassistant dockerd[548]: time="2026-09-20T17:52:32.634132333+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:42273" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:42273->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t A"
2026-09-20 14:52:32.634 homeassistant dockerd[548]: time="2026-09-20T17:52:32.634148900+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:42938" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:42938->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t AAAA"
2026-09-20 14:52:36.635 homeassistant dockerd[548]: time="2026-09-20T17:52:36.634920152+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:46700" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:46700->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t A"
2026-09-20 14:52:36.635 homeassistant dockerd[548]: time="2026-09-20T17:52:36.635218188+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:37625" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:37625->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t AAAA"
2026-09-20 15:02:32.635 homeassistant dockerd[548]: time="2026-09-20T18:02:32.635064712+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:38565" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:38565->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t A"
2026-09-20 15:02:32.635 homeassistant dockerd[548]: time="2026-09-20T18:02:32.635105476+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:47121" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:47121->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t AAAA"
2026-09-20 15:02:36.637 homeassistant dockerd[548]: time="2026-09-20T18:02:36.637551356+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:44722" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:44722->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t A"
2026-09-20 15:02:36.638 homeassistant dockerd[548]: time="2026-09-20T18:02:36.637573489+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:37572" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:37572->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t AAAA"
2026-09-20 15:12:32.634 homeassistant dockerd[548]: time="2026-09-20T18:12:32.634545987+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:57575" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:57575->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t A"
2026-09-20 15:12:32.635 homeassistant dockerd[548]: time="2026-09-20T18:12:32.634550561+03:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:172.30.33.1:43870" dns-server="udp:172.30.32.3:53" error="read udp 172.30.33.1:43870->172.30.32.3:53: i/o timeout" question=";grafana.com.\tIN\t AAAA"
The requested names are grafana.com, stun.home-assistant.io, stun.l.google.com, etc.
There are no such errors in the HA DNS logs.
DNS queries and, consequently, error messages occur at a strict 10-minute interval in series of several dozen.
The external DNS works flawlessly.
Restarting Host, HA and the DNS has not yielded any results.
I also do not understand why requests for IPv6 (AAAA) records are appearing, given that IPv6 is disabled in the network adapter settings.
I would appreciate any help or advice in clarifying the reason for this.