Reputation: 775

Flutter Emulator Error Connecting to Service Protocol

I am having an Issue with Flutter in Android studio, where whenever I run my flutter app, it will print this error; "Error connecting to the service protocol: HttpException: Connection closed before full header was received, uri = http://127.0.0.1:53305/9So9Wn564F4=/ws" , and it will "disconnect" from the app in the emulator. The app will still run, but I can't use functions like Hot Reload.

I am on a Windows machine, and Flutter Doctor does not indicate any errors. I have tried to read up on similar issues on github posts, but I have been unable to resolve the problem.

Do any of you guys have any ideas on how to solve this issue?

The problem does not occur when running on an actual device, only in the emulator.

Upvotes: 61

Answers (30)

jyorge maccaline

Reputation: 87

i got this error during run my flutter app no physical device: issue: Error connecting to the service protocol: failed to connect to http://127.0.0.1:54869/2CMry_Tdav4=/

Solution for this(it works for me): Just restart your physical device and turn off and again turn on USB debugging option from developer option on your device..!

Upvotes: 0

metin Altıkardes

Reputation: 11

I'm writing for the IntelliJ IDEA solution, probably the same in Android Studio. Add a new rule to the 'Inbound Rules' and 'Outbound Rules' sections of the firewall, and grant access to the program located at IntellijIDEAPath\jbr\bin\jcef_helper.exe. Example path: C:\Program Files\JetBrains\IntelliJ IDEA Community Version 2022.3.3\jbr\bin\jcef_helper.exe

Upvotes: 0

ali ozkara

Reputation: 5616

to my case after upgrading flutter_facebook_auth ^3.5.0 to ^5.0.8 version i had to add FacebookClientToken

iOS

Info.plist

<key>FacebookClientToken</key>
<string>YOUR-TOKEN-HERE</string>

https://developers.facebook.com/docs/ios/getting-started#configure-your-project

Android

/app/manifests/AndroidManifest.xml

<meta-data android:name="com.facebook.sdk.ClientToken" android:value="YOUT TOKEN HERE"/>

https://developers.facebook.com/docs/android/getting-started#configure-your-project

Upvotes: 1

iamJohnvesly

Reputation: 947

Turn on your Emulator. The Emulator would be switched off.

Upvotes: 3

Manar Abo-Haat

Reputation: 11

In my case :

1- lock the emulator from the the normal screen locking button.

2- unlock the emulator.

3- Press the run button in Android studio.

Upvotes: 0

Gabriel Wu

Reputation: 2086

I had the same issue when running flutter app in vscode. Here's my vscode launch configuration.

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Flutter",
      "request": "launch",
      "type": "dart",
      "flutterMode": "debug",
      "args": [
        "--verbose"
      ]
    }
  ]
}

And because i use proxy, i have some proxy settigns in environment.

export https_proxy=http://172.23.32.1:7890
export http_proxy=http://172.23.32.1:7890
export no_proxy=localhost,127.0.0.1,127.0.0.0,127.0.1.1,127.0.1.1,local.home,::1

At the beginning i didn't know why i had this problem "Error connecting to the service protocol: HttpException: Connection closed before full header was received, uri = http://127.0.0.1:xxxx/xxxx=/ws" I tried netstat -altp | grep xxxx I can see port is listened.

My Solution I restart vscode then it works.

Upvotes: -1

Onur Arda KARAKUM

Reputation: 21

If not all above them works for you.

Remove android studio, reinstall and open Android Studio
Go to "More Actions"
Go to "SDK Manager"
Click "Android SDK"
Click "SDK Tools"
Untick Android SDK Command-line Tools(latest) apply and let the program delete the files.
Go back tick Android SDK Command-line Tools(latest) and let the program download again.

It just worked for me

Upvotes: 2

براء مبارك

Reputation: 41

You can solve it by restarting your phone or emulator.

Upvotes: 2

Syed Ali

Reputation: 21

For me, I use an external device to run the output and it fails to connect the debugging url. The reason what I think is the connection between my device and PC was lost during synchronizing the data So for that, I just revoke the debugging option from the developer options in the settings. For an emulator that is created by android studio, I sue to clean the data/ wipe data/ or go to settings inside the emulator and go to storage then clear the cache data (if an app is preinstalled manually uninstall the flutter app then remove the cache). Also, run fluter clean and flutter pub get in the terminal/cmd then flutter run to target the emulator or personal device.

Upvotes: 0

Oldar Bakr

Reputation: 11

check if you have enough storage in your phone.

I had the same problem and that was the reason.

Upvotes: 1

saigopi.me

Reputation: 14918

Open AVD from Android Studio and clear data of emulator and re-run again. it worked for me.

Upvotes: 0

tazboy

Reputation: 1754

If you are using Flutter 2.10 or higher it may be that you tried to emulate a Windows desktop app but you don't have Visual Studio - develop for Windows (Visual Studio Community 2022 17.1.0) installed.

Apparently, it won't let you emulate anything until you install VS. Run flutter doctor to find out.

Upvotes: 1

Mang Hartono

Reputation: 188

I solved this problem by:

turn off my phone.
disconnect.
turn on my phone.

By doing this, you will restart the VM Service.

Upvotes: 7

Zia Ullah

Reputation: 53

I had faced the same issue but the only thing which solved my problem is to uninstall the app on my physical phone and I again try to run. and truly its work.

Upvotes: 1

William

Reputation: 501

A quick restart of the phone worked for me

Upvotes: 50

Jenny

Reputation: 71

I had a simliar problem with ios with the error message Error connecting to the service protocol: failed to connect to http://127.0.0.1:....... I solved it by removing the app from the simulator and ran a clean in xcode, then it could build successfully from vs code!

Upvotes: 1

Isira Adithya

Reputation: 344

What exactly happened

Hey I went into the same problem too. I cannot use a Emulator inside windows because my pc is a very low end pc. So, I had to use my phone instead. It is a Samsung Galaxy J2 Pro (SM-J210F) with Android 6.0.1 (Android Marshmallow). I used that phone to develop flutter apps regularly, but suddenly, I went to this problem.

Here's what happened when I tried to run "Flutter Attach" in VS-Code(v1.52.0).

command

flutter attach --machine -d 420054e7960eb400

exception

StateError: Bad state: Existing VM service clients prevent DDS from taking control.

#0      DartDevelopmentService.startDartDevelopmentService (package:flutter_tools/src/base/dds.dart:83:11)
<asynchronous suspension>
#1      FlutterDevice.connect.<anonymous closure> (package:flutter_tools/src/resident_runner.dart:249:11)
<asynchronous suspension>

Fixing the issue (In Windows 10)

So, I ran these commands to fix the issue.

Fixing the Flutter SDK

-flutter clean -v

-flutter channel stable ** (Optional if these didn't fix the issue)

-flutter upgrade -v

-flutter pub cache repair -v (Disclaimer: It will download each and every version of all the packages. Be sure to have really fast internet or give at least an hour to this.)

Configure your Proxy/VPN

If you are using a Proxy or VPN to connect to the internet,
Make sure that application isn't resolving localhost via that.(DNS)

Kill ADB and Dart processes.

After that, kill adb and dart process on Windows.
(I don't know exactly how to kill these in Mac/Linux. Sorry About That)
Run these commands in the Command Prompt.

taskkill /f /im dart*
taskkill /f /im adb* (You can run "adb kill-server" too)

Fixing the ADB in the Windows (*Optional).

Navigate to %HOMEDRIVE%:\Users%USERNAME%.android"
In my case, It is ( C:\Users\Isira Adithya.android )
Then delete adbkey.

Fixing the Android Debugging in the Android Device

Disconnect the device from the computer.
Go to Settings -> Developer Options,
Turn off USB Debugging and Turn it on again.
Revoke USB Debugging authorizations.
Restart the device.

Update Windows and Android System (If above didn't solve the problem)

Conclusion

I think these steps should fix your problem.
Also I am still 16 years old and I am not a very experienced developer.
If these didn't fix, use this to get more info. Github Issue

Upvotes: 14

thejufo

Reputation: 153

This happened to me too, the problem was I was using a vpn in my PC, I turned the vpn off, and everything just worked fine

Upvotes: 0

neel

Reputation: 54

Try

flutter doctor -v

I had faced same issue. So I run flutter doctor -v command.

Then I found the error

✗ Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses.

flutter doctor --android-licenses this command resolved my issue.

Upvotes: 2

Sandro

Reputation: 1

I was having the same error message. In my case, the problem was just a configuration that I changed in Runner.xcodeproj.

Open runner.xcodeproj in Xcode, go to the General tab -> App Icons and Lauch Images -> "Launch Screen File". I had changed it to Main and that cause the error, changing back to "LaunchScreen" option solved the problem for me.

Upvotes: 0

Jack'

Reputation: 2508

In my case, I just closed the simulator, and ran it again.

Upvotes: 1

Dheerendra Mitm

Reputation: 182

I have resolved this problem after add some code in android folder.

1.Add below code in AndroidManifest.xml

 <meta-data android:name="com.facebook.sdk.ApplicationId"
        android:value="@string/facebook_app_id"/>

    <activity android:name="com.facebook.FacebookActivity"
        android:configChanges=
            "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name" />
    <activity
        android:name="com.facebook.CustomTabActivity"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
            <data android:scheme="@string/fb_login_protocol_scheme" />
        </intent-filter>
    </activity>

2.Add your Facebook app id in strings.xml

<string name="facebook_app_id">380000000000000</string>
<string name="fb_login_protocol_scheme">fb380000000000000</string>

3.Add dependencies in pubspec.yaml

flutter_facebook_login: ^1.1.1

Pub get and run.

Upvotes: 0

kadim kareem

Reputation: 145

For me, it was caused by phone screen saver. Emulator screen was locked. After I pressed on power icon, the screen opened. then I run it again and everything is working.

Upvotes: 0

noveleven

Reputation: 637

When I deleted the emulator in AVD Manager and rebuilt it, it worked.

Upvotes: 0

GoharSahi

Reputation: 684

In virtual device manager, try one of these options.

Wipe Data
Cold Boot Now

Upvotes: 4

Shahid Sarwar

Reputation: 1209

Open the project in android studio => Start your Emulator - OR - Connect your android device with Debug mode "on" => Run the Project on android studio => Run your project from VS code or from command line using flutter run

Upvotes: 0

Zeeshan Mehdi

Reputation: 1439

For me it was caused by flutter_facebook_login plugin causing issue i removed it and i could afford to remove facebook login option but in your case you can try different version of flutter_facebook_login or you can use different plugin for loggin in using facebook.

Upvotes: 0