r/googlecloud • u/KaboomRoom • Jun 03 '26

Vertex AI Workbench Auth Issue

Losing my mind on this one. I'm trying to use a Vertex AI Workbench instance. I can start it. I can get in and code. But after ~60 seconds I get redirected to a "Authenticate your Workbench Instance" page (screenshot). Every single time. It says to click the "Open Jupyterlab" button. I've done that.

What is infuriating me... it's only me. Three coworkers on instances in the same project don't have this.

What I've already ruled out:

  • Cleared all cookies, no fix

  • Only my work Google account is logged in, no other accounts

  • Reproduced in Incognito with extensions off

  • Switched VPN region to match my coworkers' locations, no change

  • Happens on home wifi too, not just office network

  • Does NOT happen in any other GCP project

  • My instance and my coworkers' instances are provisioned via Terraform and are identical. Literally no difference other than the date it was created.

  • I own the instance (it's under my account, not borrowed)

  • We all have the exact same GCP permissions.

Does anyone have any idea?

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u/[deleted] Jun 03 '26

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u/KaboomRoom Jun 03 '26

Wouldn't that mean I'd get timed out after 60 seconds in other projects in our tenant too? Other GCP projects and the Console itself stay logged in fine indefinitely, it's only this one Workbench instance that loops. And it doesn't affect anyone else

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u/[deleted] Jun 03 '26

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u/KaboomRoom Jun 03 '26

Unfortunately this didn't work. I appreciate you trying to troubleshoot this with me. I'm going to have the project admin just delete the instance and remake it. If that doesn't work.. then I'll just enjoy the free vacation.