Could not reach Cloud Firestore backend. Connection failed 1 times

i’m using a very simple code and fetching data from firestore

import firebase from 'firebase/app';
import 'firebase/firestore'

const firebaseApp = firebase.initializeApp({
        apiKey: "...",
        authDomain: "...",
const db = firebaseApp.firestore();
export default db;

but i keep getting this error

[2021-06-05T00:58:41.274Z]  @firebase/firestore: Firestore (8.6.5): Could not reach Cloud Firestore backend. Connection failed 1 times.
Most recent error: FirebaseError: [code=permission-denied]:
 Permission denied on resource project.
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.
  1. i do have a very fast internet connection
  2. my clock is also synced with the standard time

Now, i have no clue why is this happening?

please someone help me out!!!


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

I was facing the same issue. The connection was working on some environments, but on my client’s corporate network it wasn’t.

After a loong research on the internet, I found an issue on Github talking about it.

Here’s what worked for me:

const firestoreDB = initializeFirestore(firebaseApp, {
  experimentalForceLongPolling: true, // this line
  useFetchStreams: false, // and this line

Here i’m using firebase v9. For firebase v8 it’s something like:

  experimentalForceLongPolling: true, // this line
  useFetchStreams: false, // and this line

Method 2

i was able to resolve this issue by using my credential directly where i initializeApp my firebase config, i was previously calling them from my env file i think my app was not getting the env before

Method 3

I have faced this issue as well with angular fire.
What I have changed is to add firestore settings to the provider of app module:

According to the GitHub issues discussion, I think you can try experimentalAutoDetectLongPolling first.
And option useFetchStreams is unnecessary except for users who are using very old browser versions.

import { SETTINGS as FIRESTORE_SETTINGS } from '@angular/fire/firestore';

      provide: FIRESTORE_SETTINGS,
      useValue: { experimentalAutoDetectLongPolling: true, merge: true },

and you can use mitmproxy to reproduce the firebase errors.

Method 4

Make sure your environment is pointing to the real firestone database and not the Firestore Emulator. When I came across this same issue, that was the reason.

I’m using an Angular framework so I had to comment out those environment references in my app.module.ts file.

  declarations: [AppComponent, InformUserComponent],
  entryComponents: [InformUserComponent],
  imports: [
    ServiceWorkerModule.register('ngsw-worker.js', {
      enabled: environment.production,
      // Register the ServiceWorker as soon as the app is stable
      // or after 30 seconds (whichever comes first).
      registrationStrategy: 'registerWhenStable:30000'

  providers: [AuthService, { provide: RouteReuseStrategy, useClass: IonicRouteStrategy },
    // {
    //   provide: USE_FIRESTORE_EMULATOR, useValue: environment.useEmulators ?
    //     ['localhost', 8080] : undefined
    // },
    // {
    //   provide: USE_FUNCTIONS_EMULATOR, useValue: environment.useEmulators ?
    //     ['localhost', 5001] : undefined
    // },
  bootstrap: [AppComponent],
export class AppModule { }

Could not reach Cloud Firestore backend. Connection failed 1 times

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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