[Firestore] Could not reach Cloud Firestore backend over Wifi on physical device.

[mlemos]

Describe the bug
When trying to get a document from Firestore, if the device is connected through Wifi the connection fails with the following error message:

W/Firestore( 4903): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore( 4903): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.

To Reproduce

Usually, the error happens when running in a Physical device.
I created a small app to be able to reproduce the errors with minimal interference from the rest my code. See the code below.

When you hit run on the debugger (I'm using VSCode) and then I click on the (+) button to make the request to Firestore, it stays trying for a few seconds (you'll see the progress indicator no the test app) and then the call snapshot = await docRef.get() fails with the following error message:

PlatformException(Error performing get, Failed to get document because the client is offline., null)

Then, if you turn the wifi off, the request works perfectly. And the content of the document retrieved from Firestore is present in the screen:

Now if you turn the wifi again, the request works. Sometimes the data is retrieved from the server and other from the cache.

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firestore Network Bug',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _loading = false;
  Map<String, dynamic> _firebaseDocument;
  String _firebaseError;
  String _source;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Firestore Network Bug"),
      ),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          children: <Widget>[
            Text('Tap the (+) button to try to read from Firestore...',
                style: TextStyle(fontSize: 20)),
            _showProgress(),
            _showResults(),
            _showErrors(),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _readFromFirebase,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  Widget _showProgress() {
    return Padding(
      padding: const EdgeInsets.only(top: 12.0),
      child: Container(
        height: 6.0,
        child: (_loading) ? LinearProgressIndicator() : Container(),
      ),
    );
  }

  Widget _showResults() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        SizedBox(height: 12.0),
        Text("Result:"),
        Container(
          height: 150,
          padding: const EdgeInsets.all(16),
          color: Colors.blue[100],
          child: (_firebaseDocument != null)
              ? Text("From $_source: \n\n" + _firebaseDocument?.toString(),
                  style: TextStyle(fontSize: 16))
              : Container(),
        ),
      ],
    );
  }

  Widget _showErrors() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        SizedBox(height: 12.0),
        Text("Errors:"),
        Container(
          height: 150,
          padding: const EdgeInsets.all(16),
          color: Colors.red[100],
          child: (_firebaseError != null)
              ? Text(_firebaseError?.toString(), style: TextStyle(fontSize: 16))
              : Container(),
        ),
      ],
    );
  }

  void _readFromFirebase() async {
    setState(() {
      _loading = true;
      _firebaseDocument = null;
      _firebaseError = null;
    });
    DocumentReference docRef =
        Firestore.instance.document("myCollection/myDocument");

    DocumentSnapshot snapshot = await docRef.get().catchError(
      (onError) {
        setState(() {
          _loading = false;
          _firebaseDocument = null;
          _firebaseError = onError.toString();
        });
      },
    );
    if (_firebaseError != null) return;

    _source = (snapshot.metadata.isFromCache) ? "cache" : "server";

    if (snapshot.exists) {
      setState(() {
        _loading = false;
        _firebaseDocument = snapshot.data;
      });
      print("Document found!");
      print("- ${_firebaseDocument.toString()}");
    } else {
      print("Document not found!");
    }
  }
}

Expected behavior
Since the device has perfect connectivity over wifi, it was excepted that the request worked fine and the document was retrieved from the server.

Additional context
On the emulator, everything works perfectly.
I tested in the following emulator configurations: Pixel 4 API 29, Pixel 5 API 25, Pixel 3 API 29.

The physical devices I used to test (both failed identically) where: Pixel 4XL (Android 10 QQ3Q.200605.001) and Pixel 3XL (Android 10 QQ2A.200305.002).

Flutter doctor

[✓] Flutter (Channel stable, v1.17.3, on Mac OS X 10.15.4 19E287, locale en-US)
    • Flutter version 1.17.3 at /Users/mlemos/Documents/flutter
    • Framework revision b041144f83 (8 days ago), 2020-06-04 09:26:11 -0700
    • Engine revision ee76268252
    • Dart version 2.8.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/mlemos/Library/Android/sdk
    • Platform android-30, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.5, Build version 11E608c
    • CocoaPods version 1.9.1

[!] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.46.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.11.0

[✓] Connected device (2 available)
    • Pixel 4 XL                • 99201FFBA000KF • android-arm64 • Android 10 (API 29)
    • Android SDK built for x86 • emulator-5554  • android-x86   • Android 7.1.1 (API 25) (emulator)

! Doctor found issues in 1 category.

pubspec.yaml

name: firestore_network_bug
description: A new Flutter project.
publish_to: 'none' 
version: 1.0.0+1
environment:
  sdk: ">=2.7.0 <3.0.0"
dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.3
  firebase_analytics: ^5.0.14
  cloud_firestore: ^0.13.6
dev_dependencies:
  flutter_test:
    sdk: flutter
flutter:
  uses-material-design: true

/build.gradle

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        // Application specific configuration (dependencies)
        classpath 'com.google.gms:google-services:4.3.3'
        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.1.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

/app/build.gradle

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
// Application specific configuration (plugins)
apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.google.firebase.crashlytics'


android {
    compileSdkVersion 28

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        applicationId "com.example.firestore_network_bug"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        // Application specific configuration (multidex)
        multiDexEnabled true

    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

    // Application specific configuration (dependencies)
    implementation 'com.android.support:multidex:1.0.3'
    implementation 'com.google.firebase:firebase-analytics:17.2.2'
    implementation 'com.google.firebase:firebase-crashlytics:17.0.0'
    implementation 'com.google.firebase:firebase-firestore:21.4.3'
}

[mlemos]

Here is the debug console output:

Over Wifi - When the error happens

Please note that, over Wifi, Crashlytics also fails.

Launching lib/main.dart on Pixel 4 XL in debug mode...
✓ Built build/app/outputs/apk/debug/app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:54122/cahgKkWqnBU=/ws
E/FirebaseCrashlytics(22411): Settings request failed.
E/FirebaseCrashlytics(22411): java.io.InterruptedIOException: timeout
E/FirebaseCrashlytics(22411): 	at okhttp3.RealCall.timeoutExit(RealCall.java:107)
E/FirebaseCrashlytics(22411): 	at okhttp3.RealCall.execute(RealCall.java:96)
E/FirebaseCrashlytics(22411): 	at com.google.firebase.crashlytics.internal.network.HttpRequest.execute(com.google.firebase:firebase-crashlytics@@17.0.0:129)
E/FirebaseCrashlytics(22411): 	at com.google.firebase.crashlytics.internal.settings.network.DefaultSettingsSpiCall.invoke(com.google.firebase:firebase-crashlytics@@17.0.0:86)
E/FirebaseCrashlytics(22411): 	at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:200)
E/FirebaseCrashlytics(22411): 	at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:193)
E/FirebaseCrashlytics(22411): 	at com.google.android.gms.tasks.zzp.run(Unknown Source:2)
E/FirebaseCrashlytics(22411): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/FirebaseCrashlytics(22411): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/FirebaseCrashlytics(22411): 	at com.google.firebase.crashlytics.internal.common.ExecutorUtils$1$1.onRun(com.google.firebase:firebase-crashlytics@@17.0.0:60)
E/FirebaseCrashlytics(22411): 	at com.google.firebase.crashlytics.internal.common.BackgroundPriorityRunnable.run(com.google.firebase:firebase-crashlytics@@17.0.0:27)
E/FirebaseCrashlytics(22411): 	at java.lang.Thread.run(Thread.java:919)
E/FirebaseCrashlytics(22411): Caused by: java.io.IOException: Canceled
E/FirebaseCrashlytics(22411): 	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
E/FirebaseCrashlytics(22411): 	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
E/FirebaseCrashlytics(22411): 	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
E/FirebaseCrashlytics(22411): 	at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
E/FirebaseCrashlytics(22411): 	at okhttp3.RealCall.execute(RealCall.java:92)
E/FirebaseCrashlytics(22411): 	... 10 more
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
I/ore_network_bu(22411): The ClassLoaderContext is a special shared library.
I/chatty  (22411): uid=10227(com.example.firestore_network_bug) AsyncTask #1 identical 1 line
I/ore_network_bu(22411): The ClassLoaderContext is a special shared library.
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->copyMemory(JJJ)V (greylist, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getByte(J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getByte(Ljava/lang/Object;J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->putByte(JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->putByte(Ljava/lang/Object;JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(22411): Accessing hidden field Ljava/nio/Buffer;->address:J (greylist, reflection, allowed)
V/NativeCrypto(22411): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 286 native methods...
W/ore_network_bu(22411): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (greylist, reflection, allowed)
I/ProviderInstaller(22411): Installed default security provider GmsCore_OpenSSL
W/Firestore(22411): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(22411):
W/Firestore(22411): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.

Over LTE - When things work fine

Launching lib/main.dart on Pixel 4 XL in debug mode...
✓ Built build/app/outputs/apk/debug/app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:54345/egB1v0JRe6c=/ws
W/DynamiteModule(23529): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(23529): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(23529): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
I/ore_network_bu(23529): The ClassLoaderContext is a special shared library.
I/chatty  (23529): uid=10227(com.example.firestore_network_bug) AsyncTask #1 identical 1 line
I/ore_network_bu(23529): The ClassLoaderContext is a special shared library.
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->copyMemory(JJJ)V (greylist, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getByte(J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getByte(Ljava/lang/Object;J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->putByte(JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->putByte(Ljava/lang/Object;JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden field Ljava/nio/Buffer;->address:J (greylist, reflection, allowed)
V/NativeCrypto(23529): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 286 native methods...
W/ore_network_bu(23529): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (greylist, reflection, allowed)
I/ProviderInstaller(23529): Installed default security provider GmsCore_OpenSSL
W/ore_network_bu(23529): Accessing hidden field Ljava/net/Socket;->impl:Ljava/net/SocketImpl; (greylist, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden field Ljava/io/FileDescriptor;->descriptor:I (greylist, JNI, allowed)
W/ore_network_bu(23529): Accessing hidden method Ljava/security/spec/ECParameterSpec;->setCurveName(Ljava/lang/String;)V (greylist, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden method Ldalvik/system/BlockGuard;->getThreadPolicy()Ldalvik/system/BlockGuard$Policy; (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Ldalvik/system/BlockGuard$Policy;->onNetwork()V (greylist, linking, allowed)
I/flutter (23529): Document found!
I/flutter (23529): - {date: Timestamp(seconds=1590980400, nanoseconds=0), published: true, title: Hello World!, body: Firebase rocks and Firestore rocks also (when it works).}

[Ehesp]

I highly doubt this is an issue with FlutterFire, since it has no impact on how the native SDKs handle online/offline state.

[TahaTesser]

Hi @mlemos
I followed your steps and code sample, it loads document initially with no issues.
Please try another device or emulator and device know

flutter doctor -v

[✓] Flutter (Channel dev, 1.20.0-0.0.pre, on Mac OS X 10.15.5 19F101, locale
    en-GB)
    • Flutter version 1.20.0-0.0.pre at /Users/tahatesser/Code/flutter_dev
    • Framework revision d9653445f4 (6 days ago), 2020-06-09 18:43:03 -0400
    • Engine revision e8c13aa012
    • Dart version 2.9.0 (build 2.9.0-14.0.dev 5c1376615e)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
    • Android SDK at /Users/tahatesser/Code/sdk
    • Platform android-30, build-tools 30.0.0
    • ANDROID_HOME = /Users/tahatesser/Code/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.5, Build version 11E608c
    • CocoaPods version 1.9.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.46.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.11.0

[✓] Connected device (5 available)
    • SM M305F      • 32003c30dc19668f          • android-arm64  • Android 10 (API 29)
    • Taha’s iPhone • 00008020-001059882212002E • ios            • iOS 13.5.1
    • macOS         • macOS                     • darwin-x64     • Mac OS X 10.15.5 19F101
    • Web Server    • web-server                • web-javascript • Flutter Tools
    • Chrome        • chrome                    • web-javascript • Google Chrome 83.0.4103.97

• No issues found!

Thank you

[dhuma1981]

I am also facing the similar issue, in my case, it reaches to the cloud_firestore but returns null in _data with real iOS device when connected to WiFi.

[mlemos]

HI @TahaTesser , I just performed a "reset to factory defaults" on my Pixel 3XL and the problem persisted. It happens on both my Pixel 4XL and Pixel 3XL. I'll grab another device today and perform more testing.

What is interesting is that both Firestore and Crashlytics provide error messages while running over wifi. It seems that the firebase plugin is not correctly identifying the connectivity status and is assuming that it is not connected over wifi in those circumstances.

Probably a shared code between Crashlytics and Firestore causing the error on both packages.

Crashlytics error:

E/FirebaseCrashlytics(22411): Settings request failed.
E/FirebaseCrashlytics(22411): java.io.InterruptedIOException: timeout
E/FirebaseCrashlytics(22411): 	at okhttp3.RealCall.timeoutExit(RealCall.java:107)
E/FirebaseCrashlytics(22411): 	at okhttp3.RealCall.execute(RealCall.java:96)

Firestore Error:

W/Firestore(22411): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(22411):
W/Firestore(22411): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.

[mlemos]

Hi @TahaTesser, I finally put my hands in another device and the results were the same.

I have also updated my Flutter environment and all libraries.

The key error messages are:

...
D/NetworkManagementSocketTagger(29981): tagSocket(62) with statsTag=0xffffffff, statsUid=-1
E/FirebaseInstanceId(29981): binding to the service failed
...
/FirebaseCrashlytics(29981): Settings request failed.
E/FirebaseCrashlytics(29981): java.io.InterruptedIOException: timeout
E/FirebaseCrashlytics(29981): 	at okhttp3.RealCall.timeoutExit(RealCall.java:107)
E/FirebaseCrashlytics(29981): 	at okhttp3.RealCall.execute(RealCall.java:96)
...
D/ConnectivityManager(29981): requestNetwork; CallingUid : 10263, CallingPid : 29981
W/DynamiteModule(29981): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(29981): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(29981): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
I/ject.spread_de(29981): The ClassLoaderContext is a special shared library.
I/chatty  (29981): uid=10263(net.spreadproject.spread_dev) AsyncTask #2 identical 1 line
I/ject.spread_de(29981): The ClassLoaderContext is a special shared library.
V/NativeCrypto(29981): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 286 native methods...
W/ject.spread_de(29981): Accessing hidden field Ljava/nio/Buffer;->address:J (light greylist, reflection)
W/ject.spread_de(29981): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (light greylist, reflection)
I/ject.spread_de(29981): Waiting for a blocking GC ClassLinker
I/ject.spread_de(29981): Background concurrent copying GC freed 53995(2MB) AllocSpace objects, 62(2MB) LOS objects, 67% free, 2MB/8MB, paused 281us total 107.391ms
I/ject.spread_de(29981): WaitForGcToComplete blocked ClassLinker on ClassLinker for 58.302ms
I/ProviderInstaller(29981): Installed default security provider GmsCore_OpenSSL
D/ConnectivityManager(29981): requestNetwork; CallingUid : 10263, CallingPid : 29981
D/NetworkManagementSocketTagger(29981): tagSocket(116) with statsTag=0xffffffff, statsUid=-1
W/Firestore(29981): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(29981):
W/Firestore(29981): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.
I/flutter (29981):   [2020-06-20 17:39:09.303984] DashNavigationBar >> healthStatus is: unknown
D/ConnectivityManager(29981): unregisterNetworkCallback; CallingUid : 10263, CallingPid : 29981
W/DynamiteModule(29981): Local module descriptor class for providerinstaller not found.

Flutter Doctor -v is:

[✓] Flutter (Channel stable, v1.17.4, on Mac OS X 10.15.5 19F101, locale en-US)
    • Flutter version 1.17.4 at /Users/mlemos/Documents/flutter
    • Framework revision 1ad9baa8b9 (3 days ago), 2020-06-17 14:41:16 -0700
    • Engine revision ee76268252
    • Dart version 2.8.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/mlemos/Library/Android/sdk
    • Platform android-30, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.5, Build version 11E608c
    • CocoaPods version 1.9.1

[!] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.46.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.11.0

[✓] Connected device (1 available)
    • SM J415G • 1abf0307 • android-arm • Android 9 (API 28)

! Doctor found issues in 1 category.

[mlemos]

Strangely, now the tests are like this:

• Samsung Phone => Works on Wifi and 3G.
• Pixel 3XL => Fails on Wifi & Works on 3G.
• Pixel 4XL => Fails on Wifi & Works on 3G.

All of them using the same Wifi and same 3G network.

[emostar]

@mlemos Are you able to access the firestore hostname from a browser on the devices that are not working?

[dhuma1981]

For me I have 1 Mi-A2(Android Phone) and 1 iPhoneXR here are the test results.

• Mi-A2 => Works on Wifi 1, Wifi 2 and 4G
• iPhone XR => Fails on Wifi 2, Works on Wifi 1 & Works on 4G

So I have a bit different configuration of WiFi.

Wifi 1 = Main Wifi given by the service provider (with DHCP enable)
Wifi 2 = New network created from Wifi 1 and it has its own DHCP enable

So when I connect my iPhoneXR on Wifi 2 it start throwing the exception mentioned. But I connect to Wifi 1 it works perfectly.

If I disable the DHCP of wifi 2 and use it as a switch and keep the DHCP enable of Wifi 1 then also it works perfectly.

So I think there is some issue with dynamic IP and network connection and that's why it is causing the exception(Thinking loud)

I hope this will help to resolve this issue.

[anushavenkatesh1]

I am facing a similar issue. any solution so far
Any physical device - fails on wifi and works on 4G

I got a new broadband connection yesterday and saw a few firebase package update in the package.json. Could these be related?
Any suggestion soon appreciated

[ashokdamani]

hi, I am also facing the same issue, for me it doesn't work on Airtel 4G network but it works on Idea 4G network, though both are good network providers, also I tested on WIFI, it works fine, I get same results across the devices. Please help

[devoverse]

I have the same issue, doesn't work my device Redmi Note 8 Pro - on Airtel 4G but works on Airtel 2G and also on Wifi (Airtel Broadband).
Also, not working on Samsung galaxy s8+ - Vodafone 4G.
Working on other devices I have tested till now.
But there surely is a problem with fireflutter - how can firstore say slow connection on 4G(Ookla SpeedTest - 30Mbps) but not on 2G?

[Ehesp]

FlutterFire just sends some data from Dart, which hits the native Firebase SDKs, and sends the data back once they return some data. There isn't anything to debug on our end since it's a Firebase/SDK/location problem.

Have you raised a ticket directly with Firebase?

[mlemos]

Hi All, after trying many different approaches to this error I was not able to systematically reproduce it.
Also, I noted that the errors I was getting at the time I opened this issue were related to one of the WiFi networks in my home. In other words, it worked fine in one WiFi network and not in another.

The networks are very very similar, same ISP, same configurations, same hardware, and I was not able to identify any differences between them that could be linked to the error. On my side, I quit trying to solve the issue.

However, there is definitely something here... and we need a better way to understand such basic and critical issues like network issues with Flutter and Firebase as those are key for reliability in the apps being developed.

[njustin]

Hello!

I am also facing the same issue here with Crashlytics.

Using a physical tablet (ProDVX 22") Crashlytics does not initialise correctly with the error:

D/FirebaseCrashlytics: Reports are being sent.
D/FirebaseCrashlytics: Requesting settings from https://firebase-settings.crashlytics.com/spi/v2/platforms/android/gmp/1:XXXXXXX:android:XXXXXXX/settings
D/FirebaseCrashlytics: Settings query params were: {instance=XXXXXXXXXX, build_version=1, display_version=1.0.0, source=1}
E/FirebaseCrashlytics: Settings request failed.
    java.io.InterruptedIOException: timeout
        at okhttp3.RealCall.timeoutExit(RealCall.java:107)
        at okhttp3.RealCall.execute(RealCall.java:96)
        at com.google.firebase.crashlytics.internal.network.HttpRequest.execute(com.google.firebase:firebase-crashlytics@@17.0.0:129)
        at com.google.firebase.crashlytics.internal.settings.network.DefaultSettingsSpiCall.invoke(com.google.firebase:firebase-crashlytics@@17.0.0:86)
        at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:200)
        at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:193)
        at com.google.android.gms.tasks.zzp.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
        at com.google.firebase.crashlytics.internal.common.ExecutorUtils$1$1.onRun(com.google.firebase:firebase-crashlytics@@17.0.0:60)
        at com.google.firebase.crashlytics.internal.common.BackgroundPriorityRunnable.run(com.google.firebase:firebase-crashlytics@@17.0.0:27)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: java.io.IOException: Canceled
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
        at okhttp3.RealCall.execute(RealCall.java:92)
        at com.google.firebase.crashlytics.internal.network.HttpRequest.execute(com.google.firebase:firebase-crashlytics@@17.0.0:129) 
        at com.google.firebase.crashlytics.internal.settings.network.DefaultSettingsSpiCall.invoke(com.google.firebase:firebase-crashlytics@@17.0.0:86) 
        at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:200) 
        at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:193) 
        at com.google.android.gms.tasks.zzp.run(Unknown Source:2) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) 
        at com.google.firebase.crashlytics.internal.common.ExecutorUtils$1$1.onRun(com.google.firebase:firebase-crashlytics@@17.0.0:60) 
        at com.google.firebase.crashlytics.internal.common.BackgroundPriorityRunnable.run(com.google.firebase:firebase-crashlytics@@17.0.0:27) 
        at java.lang.Thread.run(Thread.java:764) 

But with the emulator it works fine:

D/FirebaseCrashlytics: Requesting settings from https://firebase-settings.crashlytics.com/spi/v2/platforms/android/gmp/XXXXXXXX/settings
D/FirebaseCrashlytics: Settings query params were: {instance=XXXXXXXXXXX, build_version=1, display_version=1.0.0, source=1}
D/FirebaseCrashlytics: Settings request ID: null
D/FirebaseCrashlytics: Settings result was: 200
D/FirebaseCrashlytics: Writing settings to cache file...
D/FirebaseCrashlytics: Loaded settings: {"settings_version":3,"cache_duration":86400,"features":{"collect_logged_exceptions":true,"collect_reports":true,"collect_analytics":false,"prompt_enabled":false,"push_enabled":false,"firebase_crashlytics_enabled":false},"app":{"status":"activated","update_required":false,"report_upload_variant":1,"native_report_upload_variant":1},"fabric":{"org_id":"XXXXXXXXXX","bundle_id":"XXXXXX"},"expires_at":1601540531383}
D/FirebaseCrashlytics: Send via DataTransport disabled. Removing DataTransport reports.
D/FirebaseCrashlytics: Starting report processing in 1.0 second(s)…

Both are on the same Wifi network. Running the exact same app.

Going to the settings URL displayed in the log is working fine on the tablet with Chrome and also on my laptop. And the result is displayed in less than 1 second.

Official Google/Firebase support ask me to fill the issue here, since they don't address Firebase/Flutter related API.

[gorcsgergely]

Anybody had a solution for this problem?

[ThinkWriteFly]

Completely unable to access my project backend via Lan but able via 4g on mobile. identical error.
@firebase/firestore: Firestore (5.11.0): Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds. This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.
any updates would be greatly appreciated.

[HieuHongLe94]

I am having the same issue. Does anyone get any solution?

[danijorda1]

Hi, I am also facing the issue. How can´t this critical issue still not be solved?

[evaqum]

bruh

[LazyC0derX]

This is not a fix but disabling and enabling wifi or mobile data after opening the app is working for me,

[bcattaneo]

Just to contribute to the list of really weird behaviors: in our case we switched from Ethernet to WIFI (yes, on my computer, I'm not referring to the emulator) and it started working. This is truly insane.

[emerson-mec]

Emulator version 31.3.11 solved my problem.

[dreampowder]

on a windows machine, i've just updated to the latest emulator version, and then after the app launches, i disabled and re-enabled wifi and it started to work.

I think the main cause of the problem is that firestore cannot connect to the device initially, but after switching on and off the connection, it forces the plugin to reconnect

[shreyasSarve]

check do you have multidex support or vpn turnded on on your device
this worked for me

[polenvinagre]

Hi! Any solution or feedback about this issue from Firebase Team?

[iLoveDocs]

Master @Ehesp and Master @Salakar are absolutely right, this is not related to Flutter. I tested this on native Android (Java) and there I get the same error.

Few more outcomes:

• I have two WiFi network from the same router, "A" 5 GHz and "B" 2.4 GHz, at any given point, only one of them connects. Sometimes it's "A", sometimes it's "B".
• This happens in both debug and release version.
• This only happened in Android (physical device)
• Not only Firestore, but all Firebase services don't work, though they won't show you the error, they just go in the loading state. For instance, FirebaseAuth will also not work (yes, if you recently signed in, then cache will do the job for you). Likewise, Remote Config fetch takes about 2 mins to get the data, but if it has run before at least once, then cache will give you data, so you won't see loading.
• This issue has been there in Firebase since 2017.

The sad part is, here and there we are some ~100 people discussing this matter, but hardly a few would have contacted Firebase support team (needless to say I did). In fact take a look at the upvotes (though they won't mater now) on the issues, not even 20% people upvoted it. But almost everyone comes to write a comment "I'm also facing this issue". Guys, your comment won't help but an upvote will.

[arisAlexis]

I have the same problem when connecting with VPN

[felipecastrosales]

I have this problem on certain connections to a specific device. But on other devices it works as expected; This only appears in one.

Is there any workaround for this?

[TechnoMarc3]

Im experiencing the same error.
It doesnt work on my tablet (Android 13) in my home wifi, but works on my smartphone (Android 13 as well). The strange part is:
If i set up a hotspot from my smartphone, which leads to the home wifi, everything works completly fine on my tablet (although it is in fact the identical wifi, in which it didnt work before).
I really dont know how to fix that, and I dont want to changeto http requests, since I cant listen to streams.
Is there a solution, also by the Firestore dev team?

[mathsue0]

I also have the same problem, but I only noticed this problem after activating AppCheck Play Integrity on Android.

I made a video. When I try to log in via email or Google, it keeps loading forever or when I go to get data from firestore, but when I turn off Wifi and go to 4g on my operator's network, it logs in normally.

In the video I will pull data from the firestore with the Wifi connected, but it only keeps loading, as soon as I turn off the wifi it gets the information.

bug.firebase.wifi.mp4

My Device is Samsung S21 Fe 5G with Android 13.

[TechnoMarc3]

After some research and code changes I found something very interesting:
So if this error occurs on any of your device (if it worked on WiFi, or just with mobile data, or neither of these sources work) most of the times all u have to do is restart the device. That worked perfectly for me.
Otherwise I will always get a sockettimwoutexception on android, although my WiFi connection is perfectly fine (and works perfectly with other Google APIs).
So I think the error is not because of the WiFi or some WiFi settings, I think the internal firebase SDK od the device crashed and couldn't handle an internal error, so there are no requests possible anymore.
If U restart Ur device, you force the SDK to restart as well, so the error should be deleted and everything should work fine.
That's my only explanation

[mathsue0]

Got it, I'll reproduce this, anyway thanks for the answer 🤓.