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Overrides the captive portal settings of Android in the People's Republic China Mainland
#!/usr/bin/env sh
adb shell settings put global captive_portal_fallback_url http://g.cn/generate_204
adb shell settings put global captive_portal_http_url http://www.google.cn/generate_204
adb shell settings put global captive_portal_https_url https://www.google.cn/generate_204
adb shell settings put global captive_portal_other_fallback_urls http://www.qualcomm.cn/generate_204
@jacoblyw
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jacoblyw commented Oct 29, 2021

Not in China, but I had the "no internet" WiFi icon when the tablet came back from having the screen repaired. Internet worked, but automatic connections to WIFi didn't.

And then [recently] I started getting "open captive portal" messages

connect with adb shell:
adb shell

use superuser:
su

Check what setting is set (just out of curiosity):
settings get global captive_portal_server
status.eqoe.cn

I didn't bother with any of the fallback or http/https settings, I just did the following setting:
settings put global captive_portal_server "connectivitycheck.gstatic.com"

and it worked! That's a relief!

Thanks to everyone for pointing me in the right direction. (I also got some hints on the URL to use on android.Stackexchange.com, but I don't have enough reputation to post there.)

@escape0707
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escape0707 commented Oct 30, 2021

@jacoblyw That seems to be a quite scammy website. I highly suggest you to flash your whole system, including recovery and boot loader if you could.

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