It is not AdGuard page. It is Weebly 404 status page. Consider that injecting pages by DNS resolver only works for World Wide Web - I mean content you see in browser. It is not viable method for other Internet services such as e-mail, IRC, ntp etc
Since with W.10 I don't have such problems. The only conclusion that Quad9 works badly in my OS/PC. But I'm open to reading other explanations..............
I was unaware of Quad9 until reading this thread. I'm now running it and noticing no speed differential between it and OpenDNS or any other DNS service. I also came across another informative article on Quad9... Kim’s free security pick that needs to be on all your devices
How Quad9 Got Started, DNS Encryption, and How Quad9 Protects Your Privacy and Security. https://invidious.13ad.de/watch?v=bgA0w7efQC8
DNS Malware Filtering Compared: Quad9 VS Cloudflare VS DNS Filter VS OpenDNS / Cisco Umbrella https://forums.lawrencesystems.com/...-vs-dns-filter-vs-opendns-cisco-umbrella/5072 (Recent video includes response from Executive Director of Quad9).
You might like to check the speed of your DNS with this portable app: https://www.sordum.org/7952/dns-jumper-v2-2/
https://www.androidheadlines.com/2020/06/how-to-latest-chrome-dns-settings-browse-privately.html People can choose a DNS from Quad9 or CleanBrowsing and others right from the Chrome settings now, except maybe not Chrome mobile yet.
I do use that. My ISP of course, and Cloudflare are fastest, but Quad9 does well. Choice of DNS servers now comes built in with AdGuard for Windows v7.5. Currently set to Quad9 (post #81 above).
https://www.androidpolice.com/2020/04/02/cloudflare-dns-blocking-malware-adult-content/ For IP4 use: Malware Blocking Only Primary DNS: 1.1.1.2 Secondary DNS: 1.0.0.2 Malware and Adult Content Primary DNS: 1.1.1.3 Secondary DNS: 1.0.0.3
The CleanBrowsing Security Filter blocks media players on some sites that start playing, and fly out to the lower right of screen when you scroll down. On other sites CB leaves the media players alone. Good if you don't want them and bad if you do want them. The Cloudflare Malware Filter lets the media players do what they want.
I use Private DNS on my phone now with DNS over TLS with the CleanBrowsing security Filter. Encrypted DNS - DNS over TLS support DNS over TLS support is available on all our services through port 853. DNS over TLS encrypts and authenticates all your DNS traffic to protect your privacy and prevent DNS hijacking and sniffing. Support for DNS over TLS (Private DNS) has been added to Android Pie 9 and you can leverage it right away with any one of our filters: Security Filter Our security filter blocks access to phishing, malware and malicious domains. It does not block adult content. Domain:: security-filter-dns.cleanbrowsing.org IPv4 address: 185.228.168.9:853 and 185.228.169.9:853
DNSSEC and DNS-over-TLS (DoT), a protocol similar to DoH, but which encrypts the DNS connection downright, rather than hiding DNS traffic inside HTTPS. https://www.zdnet.com/article/dns-over-https-causes-more-problems-than-it-solves-experts-say/