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I keep receiving an error when running on flutter:

FirebaseAuthException ([firebase_auth/unknown] An internal error has occurred. [ Failed to connect to /10.0.2.2:9099)

I'm using a physical Android device, connected via cable, and I try to access the firebase emulator on the computer.

My flutter code:

String ip = kIsWeb ? 'localhost' : 'localhost'; // 10.0.2.2
FirebaseFirestore.instance
    .useFirestoreEmulator(ip, 8080, sslEnabled: false);
await FirebaseAuth.instance.useAuthEmulator(ip, 9099);

I used adb reverse to tunnel the localhost ports to the computer, but it still doesn't work. It seems to ignore the localhost directive and attempts to connect to 10.0.2.2.

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1 Answer 1

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When using an emulator, the Firebase SDK assumes that you're running on an actual Android Studio emulator, and maps localhost to 10.0.2.2 behind the scenes:

//Android considers localhost as 10.0.2.2 - automatically handle this for users.
if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android) {
  if ((mappedHost == 'localhost' || mappedHost == '127.0.0.1') &&
  automaticHostMapping) {
    ignore: avoid_print
    print('Mapping Firestore Emulator host "$mappedHost" to "10.0.2.2".');
    mappedHost = '10.0.2.2';
    }
}

In order to avoid this behavior, set automaticHostMapping to false:

FirebaseFirestore.instance
    .useFirestoreEmulator(ip, 8080, sslEnabled: false, automaticHostMapping: false);
await FirebaseAuth.instance.useAuthEmulator(ip, 9099, automaticHostMapping: false);

Now localhost will actually point to 127.0.0.1, and together with the adb reverse tunnel it will send the traffic to the host machine.

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