Describe the current behavior

I am currently using Colab Pro.

When I try to connect to a local runtime with T4 or G4, the connection does not work. However, when I use a local runtime with A100, it works correctly.

In other words:

• Local runtime + T4: cannot connect / does not work
• Local runtime + G4: cannot connect / does not work
• Local runtime + A100: works normally

This behavior seems inconsistent because the local runtime setup works with A100, but fails when the GPU is T4 or G4.

Describe the expected behavior

I expect Colab local runtime to work consistently across supported GPU environments.

Since local runtime works correctly with A100, I would expect the same local runtime configuration to also work with T4 and G4, or at least receive a clear error message explaining why T4 or G4 is not supported.

What web browser you are using

Google Chrome

Additional context

I am using Colab Pro.

The same local runtime environment can connect successfully when using A100, but it fails when using T4 or G4.

Minimal reproduction notebook:

[Please insert your public GitHub Gist or shareable Google Drive notebook link here]

Additional environment details:

• Colab plan: Colab Pro
• Working GPU: A100
• Not working GPU: T4, G4
• Browser: Google Chrome
• Local runtime connection: works with A100, fails with T4/G4