Any Change to DNS Settings Causes AGH to fail

[psyenzaa]

Any help appreciated with this dilemna, which has happened several times in the last week -> 10days.

AGH Version 0.107.77 tested on 2 different RPi with same results
Both RPI 4b's running Debian/Trixie 13.5
AGH installed "natively" to RPi's from AdGuardTeam/AdGuardHome script not installed in docker container

Problem:
Any type of change (does not have to be a server change, but anything on that page) to DNS settings causes AGH to stop filtering, loss of internet with non stop i/o timeout errors like:
"AdGuardHome[7012]: 2026/06/17 08:24:55.335381 [error] dnsproxy: response received upstream_type=bootstrap addr=1.1.1.1:53
proto=udp status="exchanging with 1.1.1.1:53 over udp: read udp 192.168.8.24:54878->1.1.1.1:53: i/o timeout""
Only way to correct is to stop AGH, verify status, start AGH. Although this doesn't always work and forces into a full uninstall, reinstall process.
Upstream servers DoH
Bootstrap servers: 1.1.1.1, 9.9.9.10
Not using Private Reverse DNS servers

Only one change made at a time and after each change, AGH endless timeout errors
Example when error occurred:
DNSSEC was disabled, so decided to Enable. After enabling. AGH started throwing i/o timeout errors
2nd Example after AGH restarted and functioning again
Changed DNS Server Configuration Rate Limit to slightly larger value, After saving, AGH failed
Here is a larger chunk of errors and result after latest problem and stop/start:
Note that there were a couple hundred of these same type error in the previous 2 hours

Jun 17 08:24:55 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:24:55.334465 [error] dnsproxy: response received upstream_type=bootstrap addr=9.9.9.10:53 proto=udp status="exchanging with 9.9.9.10:53 over udp: read udp 192.168.8.24:53457->9.9.9.10:53: i/o timeout"
Jun 17 08:24:55 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:24:55.335381 [error] dnsproxy: response received upstream_type=bootstrap addr=1.1.1.1:53 proto=udp status="exchanging with 1.1.1.1:53 over udp: read udp 192.168.8.24:54878->1.1.1.1:53: i/o timeout"
Jun 17 08:25:21 rpi4b1 systemd[1]: Stopping AdGuardHome.service - AdGuard Home: Network-level blocker...
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.723708 [info] signalhdlr: received signal signal=terminated
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.723820 [info] service: stopping: waiting for cleanup
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.724882 [info] stopping AdGuard Home
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.724971 [info] webapi: stopping http server
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.725745 [info] webapi: stopped http server
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.726082 [info] dnsproxy: stopping server
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.726762 [info] dnsproxy: stopped dns proxy server
Jun 17 08:25:21 rpi4b1 AdGuardHome[7012]: 2026/06/17 08:25:21.734250 [info] stopped
Jun 17 08:25:21 rpi4b1 systemd[1]: AdGuardHome.service: Deactivated successfully.
Jun 17 08:25:21 rpi4b1 systemd[1]: Stopped AdGuardHome.service - AdGuard Home: Network-level blocker.
Jun 17 08:25:21 rpi4b1 systemd[1]: AdGuardHome.service: Consumed 6min 10.512s CPU time.
Jun 17 08:32:19 rpi4b1 systemd[1]: Started AdGuardHome.service - AdGuard Home: Network-level blocker.
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.101910 [info] starting adguard home version="AdGuard Home, version v0.107.77"
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.102673 [info] service: AdGuard Home, version v0.107.77
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.102722 [info] service: control action=run
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.109452 [info] warning: no users in the configuration file; authentication is disabled
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.112922 [info] tls_manager: using default ciphers
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.120746 [info] webapi: initializing
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566564 [info] dnsproxy: upstream mode is set mode=parallel
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566628 [info] dnsproxy: cache enabled size=4096
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566652 [info] dnsproxy: max goroutines is set count=300
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566838 [info] dnsproxy: server will refuse requests of type any
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566866 [info] dnsproxy: upstream mode is set mode=parallel
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566884 [info] dnsproxy: cache enabled size=10485760
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.566903 [info] dnsproxy: max goroutines is set count=300
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.567661 [info] addrproc: processing addresses
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.567870 [info] permcheck: warning: found unexpected permissions type=directory path=/opt/AdGuardHome perm=0755 want=0700
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.567966 [info] webapi: AdGuard Home is available at the following addresses:
'NOTE: removed addresses...'
Jun 17 08:32:19 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:19.569295 [info] starting plain server server=plain addr=0.0.0.0:80
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.325552 [info] dnsproxy: starting dns proxy server
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.325636 [info] dnsproxy: creating udp server socket addr=0.0.0.0:53
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.325862 [info] dnsproxy: listening to udp addr=[::]:53
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.325886 [info] dnsproxy: creating tcp server socket addr=0.0.0.0:53
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.335551 [info] dnsproxy: listening to tcp addr=[::]:53
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.335860 [info] dnsproxy: entering udp listener loop addr=[::]:53
Jun 17 08:32:29 rpi4b1 AdGuardHome[99840]: 2026/06/17 08:32:29.335952 [info] dnsproxy: entering listener loop proto=tcp addr=[::]:53