Firebase Unity SDK Version

Oct 13, 2025 by thesweetdesigns.com 18 views

Description

Multiple members of our team have been experiencing a consistent connection problem with Firebase in different Unity Projects. Services such as Remote and Storage are not working as they once were. This issue has been ongoing since the end of February, and we have been unable to establish a connection with Firebase during startup.

Expected Behavior

During startup, a connection should be established with Firebase so we can retrieve information from services such as RemoteConfig using Fetch.

Actual Behavior

What is happening is, during the startup, an error is thrown, as if we were offline. The first error seems to be the culprit, as a connection was not possible to be established. The following errors are from our Wrapper which logs whatever it receives from Firebase.

Error Messages

The error messages are as follows:

fetching failure: http code 0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
UnityEngine.DebugLogHandler:LogFormat (UnityEngine.LogType,UnityEngine.Object,string,object[])
UnityEngine.Logger:Log (UnityEngine.LogType,object)
Firebase.Platform.FirebaseLogger:LogMessage (Firebase.Platform.PlatformLogLevel,string) (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/Unity/FirebaseLogger.cs:95)
Firebase.LogUtil:LogMessage (Firebase.LogLevel,string) (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/src/LogUtil.cs:69)
Firebase.LogUtil:LogMessageFromCallback (Firebase.LogLevel,string) (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/src/LogUtil.cs:77)
Firebase.AppUtil:PollCallbacks () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/macos_unity/x86_64/app/swig/Firebase.App_fixed.cs:4869)
Firebase.Platform.FirebaseAppUtils:PollCallbacks () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/FirebaseAppUtils.cs:33)
Firebase.Platform.FirebaseHandler:Update () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/Unity/FirebaseHandler.cs:208)
Firebase.Platform.FirebaseMonoBehaviour:Update () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/Unity/FirebaseMonoBehaviour.cs:45)

What We Have Tried

We have tried the following to resolve this issue:

Clear Package Cache
Clear Unity Cache
Change Unity version
Reinstalling Unity version
Change computers
Opening different Projects that uses the same SDK version
Disabled Firewall from Windows
Disabled Firewall from Router
Changed DNS servers to trusted ones like Google, CloudFare, ...
Connect the computer to a Mobile Hotspot using its Mobile Data (5G) and a VPN.
Creating an empty scene with only one simple script that doesn't use any of our wrappers. Using the SDK directly (Image of logs and snippet below)

public class Teste : MonoBehaviour
{
    private async void Start()
    {     
        DependencyStatus dependencyStatus = await FirebaseApp.CheckAndFixDependenciesAsync();
               
        await FirebaseRemoteConfig.DefaultInstance.FetchAsync(TimeSpan.Zero);
    }
}

What We Noticed

This issue is only happening with team members that use Windows, members using Mac/iOS are not facing this problem.

Similar Issues

We found similar issues on the Firebase Unity SDK GitHub page:

https://github.com/firebase/firebase-unity-sdk/issues/1205

Reproducing the Issue

We can easily reproduce the problem by:

Creating a new scene
Creating a new MonoBehaviour Script (script below)
Attaching this newly created script to an object in scene (MainCamera to make it easier)
Pressing Play

using System;
using System.IO;
using System.Net;
using System.Text;
using Firebase;
using Firebase.RemoteConfig;
using UnityEngine;

public class Teste : MonoBehaviour
{
    private async void Start()
    {
        DependencyStatus dependencyStatus = await FirebaseApp.CheckAndFixDependenciesAsync();
        
        await FirebaseRemoteConfig.DefaultInstance.FetchAsync(TimeSpan.Zero);
    }
}

Firebase Unity SDK Version

12.1.0

Unity Editor Version

2022.3.25f1

Installation Method

Unity Package Manager

Problematic Firebase Component(s)

Remote Config, Storage

Other Firebase Component(s) in Use

Remote Config, Messaging, Storage, Analytics, Authentication, Crashlytics

Additional SDKs Used

No response

Targeted Platform(s)

Desktop

Unity Editor Platform

Windows

Scripting Runtime

IL2CPP

Release Distribution Type

Pre-built SDK from https://firebase.google.com/download/unity

Relevant Log Output

fetching failure: http code 0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
UnityEngine.DebugLogHandler:LogFormat (UnityEngine.LogType,UnityEngine.Object,string,object[])
UnityEngine.Logger:Log (UnityEngine.LogType,object)
Firebase.Platform.FirebaseLogger:LogMessage (Firebase.Platform.PlatformLogLevel,string) (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/Unity/FirebaseLogger.cs:95)
Firebase.LogUtil:LogMessage (Firebase.LogLevel,string) (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/src/LogUtil.cs:69)
Firebase.LogUtil:LogMessageFromCallback (Firebase.LogLevel,string) (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/src/LogUtil.cs:77)
Firebase.AppUtil:PollCallbacks () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/macos_unity/x86_64/app/swig/Firebase.App_fixed.cs:4869)
Firebase.Platform.FirebaseAppUtils:PollCallbacks () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/FirebaseAppUtils.cs:33)
Firebase.Platform.FirebaseHandler:Update () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/Unity/FirebaseHandler.cs:208)
Firebase.Platform.FirebaseMonoBehaviour:Update () (at /Users/runner/work/firebase-unity-sdk/firebase-unity-sdk/app/platform/Unity/FirebaseMonoBehaviour.cs:45)

Conclusion

Q: What is the issue with Firebase in Unity Editor?

A: The issue is that Firebase is not connecting properly in Unity Editor, resulting in a fetching failure or connection error.

Q: What are the symptoms of this issue?

A: The symptoms of this issue include:

Firebase services such as Remote and Storage not working as expected
Error messages indicating a fetching failure or connection error
Unable to establish a connection with Firebase during startup

Q: What have you tried to resolve this issue?

A: We have tried the following to resolve this issue:

Clearing the Package Cache and Unity Cache
Changing the Unity version and reinstalling it
Disabling the Firewall from Windows and the Router
Changing the DNS servers to trusted ones like Google and CloudFare
Connecting the computer to a Mobile Hotspot using its Mobile Data (5G) and a VPN
Creating an empty scene with only one simple script that doesn't use any of our wrappers. Using the SDK directly

Q: Is this issue specific to a particular platform or device?

A: Yes, this issue is specific to Windows users. Mac and iOS users are not experiencing this problem.

Q: Have you found any similar issues on the Firebase Unity SDK GitHub page?

A: Yes, we found similar issues on the Firebase Unity SDK GitHub page:

https://github.com/firebase/firebase-unity-sdk/issues/1205

Q: How can I reproduce this issue?

A: You can easily reproduce this issue by:

Creating a new scene
Creating a new MonoBehaviour Script (script below)
Attaching this newly created script to an object in scene (MainCamera to make it easier)
Pressing Play

using System;
using System.IO;
using System.Net;
using System.Text;
using Firebase;
using Firebase.RemoteConfig;
using UnityEngine;

public class Teste : MonoBehaviour
{
    private async void Start()
    {
        DependencyStatus dependencyStatus = await FirebaseApp.CheckAndFixDependenciesAsync();
        
        await FirebaseRemoteConfig.DefaultInstance.FetchAsync(TimeSpan.Zero);
    }
}

Q: What Firebase Unity SDK version are you using?

A: We are using version 12.1.0.

Q: What Unity Editor version are you using?

A: We are using version 2022.3.25f1.

Q: How can I report this issue?

A: You can report this issue by creating a new issue on the Firebase Unity SDK GitHub page.

Q: Will you provide an update on this issue?

A: Yes, we will provide an update on this issue once we have more information.

Q: Can I help with resolving this issue?

A: Yes, we appreciate any help you can provide in resolving this issue.