[firebase_auth]: [firebase_auth/unknown-error] An internal error has occurred. (when calling signinwithemailandpassword on windows) about flutterfire

[Justus-M]

UPDATE: I just got confirmation that it is network related. The same user was able to connect when using a VPN. It is Firebase Auth specific though, because Firestore and Sentry still work as mentioned.

[alkseiPV]

I get the same error, but the network is individual, not corporate. vpn does not help, the application has access to the Internet, other APIs are working fine
flutter : 3.16.0,
firebase_auth: ^4.19.4
firebase_core: ^2.29.0

[Lyokone]

Hello @Justus-M, thanks for reaching out, I couldn't reproduce the issue on our end with our example app. Could you provide a reproducible sample so I can have a look?

[Justus-M]

Hi @Lyokone, thanks for your reply!

Apologies if it wasn't clear from my post, but I am not able to provide a reproducible example as it only happens on certain networks (it was reported by 3 of my customers). There is nothing special about the code, it happens on any call of signInWithEmailAndPassword (and probably any other Firebase Auth network calls).

@alkseiPV is able to reproduce it since it happens on his network.

@Lyokone is there any troubleshooting or log checking/printing @alkseiPV can do to provide more valuable information?

[Justus-M]

@alkseiPV Do you know if you have the same issue building the app on macOS and then using it on the same network?

If you can get your hands on macOS and test this would help determine if the issue is with the C++ SDK (windows specific) or a more general issue.

[alkseiPV]

@Justus-M I didn't have time to wait, I went to another instrument, sorry

[Justus-M]

@alkseiPV Do you have a mac? It would be really helpful if you could take 5 minutes to test this. I could even pay

You can download my app and try to create an account with email and password https://www.blazesql.com/download

[alkseiPV]

@Justus-M I successfully registered and reached the moment of connecting the database. so the problem is in the Windows library. By the way, a nice interface

[Justus-M]

Thanks so much for taking the time @alkseiPV and for the nice feedback.

@Lyokone There you have it, it appears to be windows specific.

[Justus-M]

@Lyokone Additionally, one of my customers said their network engineer found the issue, and it was something related to a token related to the following URL being blocked: "securetoken.googleapis.com"

I hope that helps