2.4.0 Connection freezing on Windows

I have a simple WebSocket server on Delphi. Connection from JS is working fine:

<!DOCTYPE html>
<html>
<head>
    <title>WebSocket demo client</title>
</head>

<body>

    <script>
        const socket = new WebSocket('ws://localhost:2335');

        // Connection opened
        socket.addEventListener('open', function (event) {
            socket.send('Hello Server!');
        });

        // Listen for messages
        socket.addEventListener('message', function (event) {
            console.log('Message from server "' + event.data + '"');
        });
    </script>

</body>

</html>

Now I create test app on flutter (from example):

import 'package:web_socket_channel/web_socket_channel.dart';

... web_socket_channel: ^2.4.0

void main() async {

  final wsUrl = Uri.parse('ws://localhost:2335');
  final channel = WebSocketChannel.connect(wsUrl);

  await channel.ready;

  channel.sink.add('Hello Server!');
  channel.stream.listen((message) {
    print('Message from server "$message"');
  });

}

From web (Chrome and Edge) all working fine. From Windows app freezing on this code:

await channel.ready;

No exception in flutter app. On server side only event OnConnect, data is not received

flutter doctor:

[√] Flutter (Channel stable, 3.16.5, on Microsoft Windows [Version 10.0.22621.2861], locale ru-UA)
    • Flutter version 3.16.5 on channel stable at D:\sdk\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 78666c8dc5 (9 days ago), 2023-12-19 16:14:14 -0800
    • Engine revision 3f3e560236
    • Dart version 3.2.3
    • DevTools version 2.28.4

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at D:\sdk\Android\sdk
    • Platform android-33, build-tools 31.0.0
    • ANDROID_HOME = D:\sdk\Android\sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.4.3)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.4.33205.214
    • Windows 10 SDK version 10.0.22000.0

[√] Android Studio (version 2021.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)

[√] VS Code (version 1.78.1)
    • VS Code at C:\Users\Николай\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.62.0

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22621.2861]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 120.0.6099.130
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 120.0.2210.91

[√] Network resources
    • All expected network resources are available.

dart-lang / web_socket_channel

2.4.0 Connection freezing on Windows #311