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203150 - Update Failed After Retries (Fingerprint Conflict)

Agent error code #203150 indicates that the agent attempted to update a GCP resource multiple times but each attempt failed due to a fingerprint conflict (HTTP 409 or 412). The agent exhausted its retry limit.

GCP uses fingerprints (ETags) for optimistic concurrency control. When the agent reads a resource and then attempts to update it, the update will fail if another process modified the resource in between. The agent automatically retries by re-reading the resource and applying the change again, but if conflicts persist across all retries, this error is returned.

Common causes include:

  • Another system or automation is frequently modifying the same firewall rule or security policy
  • Multiple Knocknoc agents are configured to manage the same GCP resource
  • A CI/CD pipeline or infrastructure-as-code tool (e.g., Terraform) is concurrently updating the resource
  • High user traffic is causing rapid successive grant/revocation operations that race with each other

Steps to Resolve

Identify Concurrent Modifications

  1. Check the GCP Cloud Audit Logs for the affected resource to see what other principals are modifying it
  2. In the GCP Console, navigate to Logging > Logs Explorer
  3. Filter for resource.type="gce_firewall_rule" or resource.type="security_policy" and look for Patch or Update operations from other service accounts or users

Reduce Contention

  1. If another automation tool is modifying the same resource, consider separating the Knocknoc-managed resource from resources managed by other systems
  2. Create a dedicated firewall rule or Cloud Armor rule for Knocknoc rather than sharing one with other automation
  3. If multiple Knocknoc agents are managing the same resource, consolidate to a single agent

Retry Behavior

The agent retries up to 3 times on conflict errors. If the issue is transient (e.g., a one-off concurrent modification), the next user grant or revocation should succeed. Persistent failures indicate ongoing contention that must be resolved.

Still Having Issues?

We can help you out, contact us at support@knocknoc.io.

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