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API key fails with "401 Authentication failed" after user removal

Sandesh Muralidhar
Sandesh Muralidhar
Updated

Introduction

API keys on Crusoe Cloud, including Intelligence Foundry keys used for Managed Inference workloads, are created by and tied to an individual user account. A key inherits the permissions of the user who created it, and it keeps inheriting them for its whole life. If that user's role changes, the key's effective permissions change with it. If that user is removed from the organization, the key has no valid user left to inherit from, and every request made with it fails authentication.

This is deliberate. Removing a user from your organization is how you revoke their access, and that revocation has to cover every credential they created. Otherwise a departed engineer's key would keep working from every laptop, CI secret, and config file it was ever copied into.

The side effect is a failure pattern that is confusing to debug. A key that worked for months suddenly starts returning 401 Authentication failed. The key was not expired. It was not deleted or modified by Crusoe. What actually happened is that someone in the organization offboarded a teammate, and that teammate owned the key running in production.

The timing makes it harder to correlate. The 401 errors do not necessarily start at the moment the user is removed — they can begin some minutes later, which makes the removal easy to miss as the cause.

This article shows how to confirm this is what happened, how to recover, and how to keep production workloads from depending on any single person's account.

Prerequisites

  • Organization Admin Access to the Crusoe Console
  • The Failing API Key Identified (The Key Your Workload Sends)

Instructions

Step 1: Confirm the Failure Mode

Requests using the key fail with:

401 Authentication failed

Before going further, rule out the more common causes of a 401. A key that was mistyped, truncated, or mangled by shell quoting (Crusoe keys can contain $ characters, which Bash and Zsh expand inside double quotes) fails the same way. See How-To Handle Special Characters in API Keys (TypeScript & JSON).

The pattern this article covers is different: the key was working, nothing in your configuration changed, and then it started failing.

ℹ️ Note: A related behavior, per the Managing Users documentation: if the key's owner has their role changed rather than being removed, the key's effective permissions change accordingly. The same inheritance rule is behind both situations.

Step 2: Check Your Organization's Audit Log

In the Crusoe Console, go to Admin > Audit Logs and look for a user removal event shortly before the 401 errors began.

ℹ️ Note: Allow for a delay. The first 401 can appear some minutes after the removal rather than immediately. Search the audit log starting from roughly an hour before the errors began.

Step 3: Identify the Key's Owner

Every API key belongs to the user who created it. If the user removed in Step 2 is the one who created the failing key, you have your root cause.

You can review your organization's active keys in the Console under Admin > Security. Infrastructure keys are on the Cloud API keys tab and Managed Inference keys are on the Intelligence API keys tab.

Step 4: Create a Replacement Key and Repoint Your Workload

Create a new API key under an active user account and update your workload to use it. Confirm the new key appears as active under Admin > Security before rolling it out.

The new key inherits the permissions of whoever creates it. Create it under an account whose role matches what the workload needs, rather than defaulting to an organization admin.

ℹ️ Note: The secret is displayed only once, at creation. Store it in your secrets manager before leaving the page.

Step 5: Audit for Other Keys Owned by the Removed User

All keys created by the removed user stopped working at the same time, not just the one you noticed. Review any other workloads, scripts, or CI pipelines that may be using keys created by that user and replace those too.

Pay particular attention to anything that runs on a schedule. A weekly job can fail days after the removal, long after anyone connects it to the offboarding.

Step 6: Prevent This From Happening Again

Until organization-level key ownership is available, prevention is a matter of offboarding process:

  • Keep production keys under an account that will not be affected by team offboarding, rather than an individual engineer's personal account.
  • Before removing a user from the organization, list the keys they created and rotate any that are in use.
  • Treat "remove user" as a production-impacting change when that user has ever created API keys. Plan the rotation, but do not let it delay the removal.
  • Name each key after the workload that uses it, so you can tell at a glance what will break when its owner leaves.

⚠️ Warning: Do not re-invite the removed user, postpone their removal, or keep their account active to restore a failing key. Replace the key instead. A departed user's credentials remaining valid is exactly the exposure this behavior exists to prevent. If a removal cannot wait, such as an involuntary departure, remove the user first and replace the keys afterward.

ℹ️ Note: Crusoe will be launching service accounts, which will allow API keys to be owned at the organization level instead of by individual users. Once available, production keys should be created under a service account so that user offboarding can never invalidate them. Until then, the practices above are the way to protect production workloads.

Resolution

The 401 errors were caused by the removal of the user who created the API key. Crusoe API keys inherit the permissions of their creating user, so when that user was removed from the organization, the key no longer had a valid user to inherit permissions from and authentication began to fail shortly after. The key was not expired, and it was not deleted or modified by Crusoe. Creating a new key under an active user and repointing the workload restored service.

Example

An organization offboards an engineer in the afternoon, removing their user account from the Crusoe Console. About twenty minutes later, the team's production inference traffic starts failing with 401 Authentication failed. Nothing was deployed and no key was knowingly changed, so the team suspects key expiry or a provider-side problem.

The audit log shows the user removal minutes before the failures began, and the failing key turns out to have been created by the offboarded engineer. The team creates a new key under an active account, repoints the workload, and audits the removed user's remaining keys, finding one more in a CI pipeline that would have failed on its next run.

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