When I upgraded to 1.22, the socket didn't work

[YowFung]

The functionality of sockets in my code has been ok until now, but since I upgrade the flutter to 1.22 version today, TCP sockets are not work, but UDP can work. It show like this:
SocketException: Insecure socket connections are disallowed by platform: 192.168.1.4
I sure that 192.168.1.4 is no exception and I can connect to it on my computer with tcp client.

[hamdikahloun]

Hi @YowFung

Can you provide please:

• flutter doctor -v

• flutter run -v

• minimal complete reproducible code sample

[darshankawar]

Hi @YowFung,
Please elaborate on the issue along with which version you were on earlier. Also provide flutter doctor -v and minimal complete code sample that shows the issue.
Thanks.

[duncanista]

Insecure connections are disabled in new APIs. Check this.

Related issue.

[YowFung]

This is the code snippet where I get the above exception:

final streamUrl = "http://192.168.1.4/stream";
final request = Request("GET", Uri.parse(streamUrl));
this._httpClient = Client();
this._response = await this._httpClient.send(request);        // Exceptional

and

try {
   socket = await Socket.connect(address, port, timeout: Duration(seconds: Global.SocketConfig.telnetConnectTimeout));    // Exceptional
} catch(exc) {
  onThreadError("Unable to open telnet connection($exc).");
}

But the following code is normal:

try {
  this._socket = await RawDatagramSocket.bind(InternetAddress.anyIPv4, port);     // Normal
  this._socket.broadcastEnabled = true;

  helper.listen(this._socket, (res) => listenCallback(res, this));
  return true;
}
catch (exc) {
  Global.log.error("Unable to open broadcast connection: $exc", [port]);
  this.close();
  return false;
}

I switch the flutter branch (flutter channel stable) from master to stable yesterday, and now it working normally.

So I forget the flutter doctor -v information of the previous version. I only remember that the version with the problem occurred after I executed the flutter upgrade command yesterday.

Now I switch back the branch to master, and executed the flutter doctor -v. It shows:

[√] Flutter (Channel stable, 1.20.2, on Microsoft Windows [Version 10.0.18362.1016], locale zh-CN)
    • Flutter version 1.20.2 at D:\SDK\Flutter\stable
    • Framework revision bbfbf1770c (3 weeks ago), 2020-08-13 08:33:09 -0700
    • Engine revision 9d5b21729f
    • Dart version 2.9.1
    • Pub download mirror https://pub.flutter-io.cn
    • Flutter download mirror https://storage.flutter-io.cn

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
    • Android SDK at D:/SDK/Android
    • Platform android-30, build-tools 30.0.0
    • ANDROID_HOME = D:\SDK\Android
    • ANDROID_SDK_ROOT = D:\SDK\Android
    • Java binary at: C:\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Android Studio (version 4.0)
    • Android Studio at C:\Android\Android Studio
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] VS Code (version 1.48.2)
    • VS Code at C:\Users\YowFu\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.13.2

[!] Connected device
    ! No devices available

! Doctor found issues in 1 category.

It shows version 1.20 here, but actually I remembered it was version 1.22.

[darshankawar]

@YowFung it seems switching back to stable has resolved your issue ?

[YowFung]

@darshankawar Yep, but it seems an OS-level secure problem according to duncanista's link. Maybe I get this exception is because of the flutter fixed the security problem in its newest version.

[YowFung]

@duncanista Thanks! I have known about the cause of this problem. I tried using the method in your link, but it throws another exception for me:

D:\workspace\git\IPControl_App\src>flutter run -d "AGS2 AL00"
Launching lib\main.dart on AGS2 AL00 in debug mode...

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
   > Android resource linking failed
     D:\workspace\git\IPControl_App\src\android\app\src\main\AndroidManifest.xml:47:9-49:63: AAPT: error: resource xml/network_security_config (aka com.vdirector.data:xml/network_security_config) not found.


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 8s
Running Gradle task 'assembleDebug'...                                  
Running Gradle task 'assembleDebug'... Done                         9.0s
The built failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try using Jetfier to solve the incompatibility.
Building plugin flutter_plugin_android_lifecycle...
Running Gradle task 'assembleAarRelease'...                             
Running Gradle task 'assembleAarRelease'... Done                    1.6s

D:\SDK\Flutter\stable\.pub-cache\hosted\pub.flutter-io.cn\flutter_plugin_android_lifecycle-1.0.8\android\src\main\java\io\flutter\embedding\engine\plugins\lifecycle\FlutterLifecycleAdapter.java:8: ??: ???androidx.lifecycle???
import androidx.lifecycle.Lifecycle;
                         ^
D:\SDK\Flutter\stable\.pub-cache\hosted\pub.flutter-io.cn\flutter_plugin_android_lifecycle-1.0.8\android\src\main\java\io\flutter\embedding\engine\plugins\lifecycle\FlutterLifecycleAdapter.java:22: ??: ?????
  public static Lifecycle getActivityLifecycle(
                ^
  ??:   ? Lifecycle
  ??: ? FlutterLifecycleAdapter
2 ???

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s


Exception: The plugin flutter_plugin_android_lifecycle could not be built due to the issue above.

This is my XML configuration:

Android/app/src/main/AndroidMainifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.vdirector.data">
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="VDirector"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">

            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />

            <meta-data
              android:name="io.flutter.embedding.android.SplashScreenDrawable"
              android:resource="@drawable/launch_background"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
        <meta-data
            android:name="io.flutter.network-policy"
            android:resource="@xml/network_security_config" />
    </application>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.SET_ORIENTATION"/>
    <uses-permission android:name="android.permission.MANAGE_DOCUMENTS"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
</manifest>

[YowFung]

I have solved this issue using @duncanista 's way. It turns out I forgot to create the android/app/src/main/res/xml/network_security_config.xml file. Thank you all very much

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.