ameshkov
commented
2 years ago I know connectivitycheck.gstatic.com/generate_204 or www.gstatic.com/generate_204 or client*.google.com/generate_204 (..client3 mostly) are used for Android, and maybe www.msftncsi.com/ncsi.txt and www.msftconnecttest.com/connecttest.txt for Windows 10.
Neither of these are blocked by AdGuard DNS.
Any idea what else could be causing this behavior on your device?
setting AdGuard-DNS servers in my router seems to mark the networks as "Without Internet".
both with Windows 10, and with Android clients that use a custom firmware (AOSP based, such as LineageOS for example).
I know
connectivitycheck.gstatic.com/generate_204orwww.gstatic.com/generate_204orclient*.google.com/generate_204(..client3mostly) are used for Android, and maybewww.msftncsi.com/ncsi.txtandwww.msftconnecttest.com/connecttest.txtfor Windows 10.linux lite/linux Ubuntu network quality enumeration is also showing similar results.
the status of the network as presented with Windows 10 WiFi / LAN menu pre-connection is shown as "no-internet", but after actually connecting the status is changed showing full connectivity, same with Android. There are no actual internet access issues, but the false status interfere with a lot of processes across multiple operation systems.
I did not notice this issue after selecting different DNS-servers from https://kb.adguard.com/en/general/dns-providers and restarting my router.
notes/workarounds..
official samsung firmwares (not really AOSP based), will use their own servers which are not blocked. there is a workaround for Android ADB-accessible devices to modify the global settings of `captive_portal_server` (for alternative hostname) and `captive_portal_https_url` (complete URL) to change it to another server. I had my raspberry pi zero w2 run ubuntu with privoxy, act as a proxy through the router and returning everything with `204` in its path immediately with HTTP 204, while letting other connections through. still not really a great solution but it keeps my phone WiFi from disconnecting, since apparently there is a repeating check every 5 minutes or so to see if there "is an internet" (and it fails, and favor the data-plan which does not pipe through AdGuard-DNS, so it "pings" successfully).as for `captive_portal_https_url`/`captive_portal_http_url`, as a fallback I'm also modifying (where I can manage to have super user access) the android devices to use those 204-servers, yes google, which seems that most of its servers support the `/generate_204` path. I had to specify few (the ones that seems to do not deliver ads or collect analytics are on top), I have http first since I sometime need to work with network sniffing and without proper certificate, and I'm also specifying IP to avoid DNS-resolving.. ```txt http://fonts.gstatic.com/generate_204 http://142.250.185.227/generate_204 https://fonts.gstatic.com/generate_204 https://142.250.185.227/generate_204 https://fonts.googleapis.com/generate_204 https://142.250.185.74/generate_204 https://apis.google.com/generate_204 https://142.250.185.110/generate_204 https://www.youtube-nocookie.com/generate_204 https://142.250.186.110/generate_204 https://www.youtube.com/generate_204 https://142.251.1.93/generate_204 https://www.gstatic.com/generate_204 https://64.233.165.94/generate_204 ``` I've tried to avoid a really bad solution of simply specifying HOSTS entry for them, in order to avoid specifying a single machine out of a pool, but it should also, probably work... I, also, would love to have a some sort of 204-returning-path in AdGuard-DNS servers as an alternative to existing google/samsung servers..
and I'm fully aware of that those servers might also be used for delivering adware/analytics, and I'm personally fine with adguard-dns blocking all those \@\$\% servers, and manually connecting to WiFi again and again..
I just thought you should be aware of it since it does not seems to be documented elsewhere..
screenshots