nslookup timedout when use browsing security and parent control service in General Settings.

[wxf26054]

These are errors in the log output.

[ameshkov]

Well, it just means that dns-family.adguard.com is not reachable from your place.

Could it be your ISP blocking it?

[wxf26054]

No, It shows ping value is high, but not blocked by the ISP.

[ameshkov]

Well, pinging is not the same as making a query, also packet loss is quite high.

Try using dnslookup and do some simple DNS queries:
dnslookup example.org https://dns-family.adguard.com/dns-query

[wxf26054]

It has normal Query answer.

[ameshkov]

How long does it take to respond?

[wxf26054]

It seems normal, maybe this problem is caused by China's GFW service.

[ameshkov]

Yeah, this may be the reason indeed, GFW may limit HTTPS connections.

[ppfeufer]

Got the same issue, enabling browsing security results in AdGuardHome being unresponsive after a while and blocking network traffic

;; QUESTION SECTION:
;discord.com.   IN       A

2021/12/08 06:03:07.469947 1009#29196 [debug] github.com/AdguardTeam/AdGuardHome/internal/dnsfilter.(*DNSFilter).checkSafeBrowsing(): SafeBrowsing lookup for discord.com; Elapsed time: 3001ms
2021/12/08 06:03:07.470253 1009#29196 [debug] github.com/AdguardTeam/dnsproxy/proxy.(*Proxy).udpHandlePacket(): error handling DNS (udp) request: talking to dnsUpstream failed, cause: dnsfilter failed to check host "discord.com": safe browsing: couldn't do a GET request to 'https://dns-family.adguard.com:443/dns-query', cause: Get "https://dns-family.adguard.com:443/dns-query?dns=IoMBAAABAAAAAAAABGM4ZTgCc2IDZG5zB2FkZ3VhcmQDY29tAAAQAAE": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
2021/12/08 06:03:07.470422 1009#29319 [debug] using settings for client [PC] thor with ip 192.168.178.20 and id ""
2021/12/08 06:03:07.470712 1009#29319 [debug] etchostscontainer: answer: discord.com -> []
2021/12/08 06:03:07.472546 1009#29319 [debug] github.com/AdguardTeam/AdGuardHome/internal/dnsfilter.check(): SafeBrowsing: checking discord.com: c8e8.sb.dns.adguard.com.
2021/12/08 06:03:07.473309 1009#29319 [debug] https://dns-family.adguard.com:443/dns-query: sending request TXT c8e8.sb.dns.adguard.com.

dnslookup:

$ ./dnslookup example.org https://dns-family.adguard.com/dns-query
dnslookup v. v1.5.1
dnslookup result:
;; opcode: QUERY, status: NOERROR, id: 43372
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;example.org.   IN       A

;; ANSWER SECTION:
example.org.    12218   IN      A       93.184.216.34