Programming Tutorials

Emulator: WARNING | *** No gRPC protection active, consider launching with the -grpc-use-jwt flag.***

By: Farida in Android Tutorials on 2023-04-03  

The warning message No gRPC protection active, consider launching with the -grpc-use-jwt flag indicates that the gRPC traffic between the emulator and the host machine is not secure. By default, gRPC traffic is not encrypted or authenticated, which can be a security risk.

To address this warning, you can launch the emulator with the -grpc-use-jwt flag, which enables JSON Web Token (JWT) authentication for gRPC traffic. JWT is a widely used open standard for securely transmitting information between parties.

To launch the emulator with the -grpc-use-jwt flag, follow these steps:

  1. Open the AVD Manager in Android Studio
  2. Click the pencil icon next to the emulator you want to launch
  3. Click the "Show Advanced Settings" button
  4. Scroll down to the "Command line options" section
  5. Add the following flag: -grpc-use-jwt
  6. Click the "Finish" button to save the changes

After launching the emulator with this flag, you should see a message in the console output that confirms the gRPC traffic is now using JWT authentication.






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abcdsays...

Not working pls tell another solutuion

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Normansays...

Which emulator are you using? have you tried another emulator? try creating a new emulator with the latest sdk. You can directly start the emulator from command prompt like 'emulator -grpc-use-jwt'

(Edited)

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