about strange "gstatic.com" access in Android M

[Andy Quan]

Hi all,

I am doing some debugging jobs on Android M version. And I find there is secret data access to "216.58.xxx.xxx" once every few minutes from my device. This IP seems to be Google related. But I have not installed any GMS thing on my device. That means my device is a pure native Android M phone.

It seems this communication is from system_server. Anyone here has any idea what this is? I have not seen this previously on Android L.

busybox netstat -ntp

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

tcp 0 0 ::ffff:10.75.54.193%385044:60899 ::ffff:54.230.215.101%4384144:80 ESTABLISHED 1282/system_server

tcp 0 0 ::ffff:10.75.54.193%385044:43037 ::ffff:216.58.221.46%4407184:80 FIN_WAIT2 -

tcp 0 0 ::ffff:10.75.54.193%385044:42181 ::ffff:216.58.221.46%4407568:80 ESTABLISHED 1282/system_server

tcp 0 0 ::ffff:10.75.54.193%385044:50615 ::ffff:216.58.221.46%4407776:80 FIN_WAIT2 -

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Thanks,
Andy

[Jean-Baptiste Queru]

Are you sure it's not trying to access the generate_204 URI that is used by the WiFi system to detect whether the device is behind a captive portal?

JBQ

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Jean-Baptiste M. "JBQ" Quéru

Mobile Excellence Pundit

Architect, Mobile, Yahoo

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[Andy Quan]

Hi JBQ,

Thank you for your reply. Would you please advise how to recognize this "generate_204"? Or more description? Actually this problem is also found when cellular path is used only.

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Thanks,
Andy

[Diogo Ferreira]

Hi,

In addition to the captive portal, this is part of the connection liveness check. Check frameworks/base/services/core/java/com/android/server/connectivity/NetworkMonitor.java.

Diogo

[Andy Quan]

Diogo, thank you for your help.