AdguardHome + Unbound unstable connections and cannot load websites sometimes

General Discussion
1

After latest AdguardHome update im having some hiccups and not connecting to website unless refreshing them a few times… the only thing i did was update AdguardHome… This is what im getting through investigating…

 unbound.service - Unbound DNS server
     Loaded: loaded (/lib/systemd/system/unbound.service; enabled; preset: enabled)
    Drop-In: /etc/systemd/system/unbound.service.d
             └─dietpi.conf
     Active: active (running) since Sat 2025-03-29 18:17:05 GMT; 2 months 8 days ago
       Docs: man:unbound(8)
   Main PID: 502 (unbound)
      Tasks: 1 (limit: 2197)
     Memory: 43.8M
        CPU: 1h 32min 53.292s
     CGroup: /system.slice/unbound.service
             └─502 /usr/sbin/unbound -d -p

journalctl -u unbound
-- No entries --

dig @127.0.0.1 -p 5335 dietpi.com

; <<>> DiG 9.18.28-1~deb12u2-Debian <<>> @127.0.0.1 -p 5335 dietpi.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13413
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;dietpi.com.                    IN      A

;; ANSWER SECTION:
dietpi.com.             249     IN      A       104.21.12.65
dietpi.com.             249     IN      A       172.67.193.183

;; Query time: 0 msec
;; SERVER: 127.0.0.1#5335(127.0.0.1) (UDP)
;; WHEN: Fri Jun 06 23:35:20 BST 2025
;; MSG SIZE  rcvd: 71

 ss -tulpn | grep LISTEN
tcp   LISTEN 0      4096         0.0.0.0:443        0.0.0.0:*
tcp   LISTEN 0      4096       127.0.0.1:8088       0.0.0.0:*
tcp   LISTEN 0      4096         0.0.0.0:2283       0.0.0.0:*
tcp   LISTEN 0      4096         0.0.0.0:81         0.0.0.0:*
tcp   LISTEN 0      4096         0.0.0.0:80         0.0.0.0:*
tcp   LISTEN 0      32           0.0.0.0:21         0.0.0.0:*
tcp   LISTEN 0      1000         0.0.0.0:22         0.0.0.0:*
tcp   LISTEN 0      1024         0.0.0.0:8001       0.0.0.0:*
tcp   LISTEN 0      4096         0.0.0.0:9002       0.0.0.0:*
tcp   LISTEN 0      256        127.0.0.1:5335       0.0.0.0:*
tcp   LISTEN 0      1000            [::]:22            [::]:*
tcp   LISTEN 0      4096               *:53               *:*
tcp   LISTEN 0      4096               *:8083             *:*
tcp   LISTEN 0      4096               *:8086             *:*
tcp   LISTEN 0      4096               *:3001             *:*

 journalctl -u adguardhome
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.840460 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.840618 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.840693 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABGFlNmUEMjQyOQJzYgNkbnMHYWRndWFyZANjb20AABAAAQ\": context deadline exceeded"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.841117 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABGJiNWIEMmZjNwQ0OTFlAnNiA2RucwdhZGd1YXJkA2NvbQAAEAAB\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.841151 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDAzOWECc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.841180 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDVkY2IEYWRjMQJzYgNkbnMHYWRndWFyZANjb20AABAAAQ\": context deadline exceeded"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.841116 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABGJiNWIEMmZjNwQ0OTFlAnNiA2RucwdhZGd1YXJkA2NvbQAAEAAB\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.841220 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDVkY2IEYWRjMQJzYgNkbnMHYWRndWFyZANjb20AABAAAQ\": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)"
Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.841816 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDAzOWECc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)"
Jun 06 20:57:37 indaRaspberry AdGuardHome[472]: 2025/06/06 20:57:37.547821 ERROR response received addr=127.0.0.1:5335 proto=udp status="exchanging with 127.0.0.1:5335 over udp: read udp 127.0.0.1:46222->127.0.0.1:5335: i/o timeout"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.854715 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABGMxMDkENGU0OARmN2EwAnNiA2RucwdhZGd1YXJkA2NvbQAAEAAB\": net/http: request canceled (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.854850 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDNkZjYEODkzMgJzYgNkbnMHYWRndWFyZANjb20AABAAAQ\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.854919 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDE5ZGYCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855114 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDJhZGMCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": net/http: request canceled (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855211 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDJhZGMCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855289 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDkzZGUCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": net/http: request canceled (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855362 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDE5ZGYCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855483 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDkzZGUCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855607 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDJhZGMCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.855695 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDVmMmYCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:52:02 indaRaspberry AdGuardHome[472]: 2025/06/06 19:52:02.606597 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABGFkYzgEM2VlZQJzYgNkbnMHYWRndWFyZANjb20AABAAAQ\": net/http: request canceled (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:49:38 indaRaspberry AdGuardHome[472]: 2025/06/06 19:49:38.319556 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABGQzOWUENDFlZARiY2MxAnNiA2RucwdhZGd1YXJkA2NvbQAAEAAB\": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:02.658578 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:02.729466 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:02.982895 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:03.099876 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:03.099897 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:03.153645 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:03 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:03.154528 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"
Jun 06 19:51:32 indaRaspberry AdGuardHome[472]: 2025/06/06 19:51:32.677325 ERROR response received addr=https://family.adguard-dns.com:443/dns-query proto=tcp status="requesting https://family.adguard-dns.com:443/dns-query: Get \"https://family.adguard-dns.com:443/dns-query?dns=AAABAAABAAAAAAAABDkwY2UCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE\": context deadline exceeded"

cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "resolvectl status" to see details about the actual nameservers.

Anything Im missing or something broken…

Thanks

3

Hello w0rtez.

Yea, something is off.
DNS requests are normally done via UDP, but as you can see on port 5335 runs something which listens for TCP only.
By default unbound should listen for both protocols. But idk if AdGuard creates it’s own config for unbound, but I doubt it.

tcp   LISTEN 0      256        127.0.0.1:5335       0.0.0.0:*

Jun 06 20:03:04 indaRaspberry AdGuardHome[472]: 2025/06/06 20:03:04.840460 ERROR response received addr=127.0.0.1:5335 proto=udp status="dialing 127.0.0.1:5335 over udp: dial udp 127.0.0.1:5335: i/o timeout"

Can you run the ss command with sudo, so we can see more details.

sudo ss -tulpn

And did you mess with the unbound config?
There are some settings, like

do-udp: yes
do-tcp: yes

You can check the config with cat /etc/unbound/unbound.conf.d/dietpi.conf
Also check what config files are present: ls -la /etc/unbound/unbound.conf.d