Duo Security incident
Duo - Partial Hardware Token Authentication Issues - United States
Duo Security experienced a minor incident on September 3, 2026 affecting Core Authentication Service and Core Authentication Service and 1 more component, lasting 1h 19m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Sep 03, 2026, 10:04 PM UTC
We are investigating a partial outage affecting Duo hardware token authentication for customers on affected US deployments. Customers using hardware tokens may experience intermittent authentication failures. Based on current information, retrying the authentication attempt is expected to succeed. Other Duo authentication methods are not expected to be impacted and can be used as alternate methods if configured and available. Our engineering team is actively investigating and has started mitigation steps. Updates and additional details will be provided as new information becomes available. We appreciate your patience and understanding during this time.
- monitoring Sep 03, 2026, 10:30 PM UTC
We have seen the failure rate for Duo hardware token authentication subside on affected US deployments. Customers using hardware tokens may still experience intermittent authentication failures while we continue to monitor. Retrying the authentication attempt is expected to succeed. Other Duo authentication methods are not expected to be impacted and can be used as alternate methods if configured and available. We will continue to monitor service stability and provide additional updates as needed.
- resolved Sep 03, 2026, 11:24 PM UTC
This issue has been resolved. Duo hardware token authentication is now functioning normally on affected US deployments. Other Duo authentication methods were not expected to be impacted. Thank you for your patience. If you continue to experience issues, please contact Duo Support.