context deadline exceeded

[YBS-PC]

what does the error "context deadline exceeded" mean and how to fix it

319	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396096 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABCWluc3RhZ3JhbQNjb20AAAEAAQAAKQgAAACAAAAA\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
320	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396284 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABCWluc3RhZ3JhbQNjb20AAAEAAQAAKQgAAACAAAAA\": context deadline exceeded"
321	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396384 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABA2NkbhRzYW1zdW5nY2xvdWRzb2x1dGlvbgNjb20AAAEAAQAAKQgAAACAAAAA\": context deadline exceeded"
322	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396447 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABBGVjaG8KaW50ZXJuZXRhdAJ0dgAAAQABAAApCAAAAIAAAAA\": context deadline exceeded"
323	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396464 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABEW5vdGlmaWNhdGlvbmluYm94CHhib3hsaXZlA2NvbQAAAQABAAApCAAAAIAAAAA\": context deadline exceeded"
324	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396546 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABA25zMQZnb29nbGUDY29tAAABAAEAACkIAAAAgAAAAA\": context deadline exceeded"
325	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396557 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABCHNreWRyaXZlA3ducwd3aW5kb3dzA2NvbQAAAQABAAApCAAAAIAAAAA\": context deadline exceeded"
326	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396633 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABA25zMQZnb29nbGUDY29tAAABAAEAACkIAAAAgAAAAA\": context deadline exceeded"
327	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396654 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABCHNreWRyaXZlA3ducwd3aW5kb3dzA2NvbQAAAQABAAApCAAAAIAAAAA\": context deadline exceeded"
328	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396700 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABCXJ1dHJhY2tlcgNvcmcAAAEAAQAAKQgAAACAAAAA\": context deadline exceeded"
329	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396749 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABBHByb3YUc2Ftc3VuZ2Nsb3Vkc29sdXRpb24DY29tAAABAAEAACkIAAAAgAAAAA\": context deadline exceeded"
330	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396781 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABCXJ1dHJhY2tlcgNvcmcAAAEAAQAAKQgAAACAAAAA\": context deadline exceeded"
331	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396880 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABBHhib3gEaXB2NgltaWNyb3NvZnQDY29tAAABAAEAACkIAAAAgAAAAA\": context deadline exceeded"
332	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396891 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABBHhib3gEaXB2NgltaWNyb3NvZnQDY29tAAABAAEAACkIAAAAgAAAAA\": context deadline exceeded"
333	Fri May 24 19:24:06 2024	daemon	err	AdGuardHome[2942]: 2024/05/24 19:24:06.396984 [error] dnsproxy: https://1.1.1.2:443/dns-query: response received over udp: "requesting https://1.1.1.2:443/dns-query: Get_0rtt \"https://1.1.1.2:443/dns-query?dns=AAABAAABAAAAAAABBGVjaG8KaW50ZXJuZXRhdAJ0dgAAAQABAAApCAAAAIAAAAA\": context deadline exceeded"

[ainar-g]

A timeout, basically. You can either change the upstream or increase the upstream timeout in the configuration.

[YBS-PC]

probably this setting increase the upstream timeout
upstream_timeout: 2s
it's probably better to change the upstream if it can't respond in 2 seconds

[dmsza]

I am also getting these errors. I already tried 8.8.8.8, 1.1.1.1 and others.

I am experiencing this issue in three different installations (two running AdGuardHome in OpenWrt, and one running AdGuardHome in DietPi). All internet connections are stable (fiber), and I am monitoring 8.8.8.8 and 1.1.1.1 with ping, not timeout detected.

EDIT 2025-04-30: I've found that changing upstream DNS from https to tls seems to reduce/eliminate the timeout errors. Will keep investigating.