Duo Security experienced a major incident on January 22, 2026 affecting Core Authentication Service, lasting 1h 42m. The incident has been resolved; the full update timeline is below.
Affected components
Core Authentication Service
Update timeline
- investigating Jan 22, 2026, 06:36 PM UTC
We are investigating an issue causing authentication failures on our DUO4 deployment. Please check back here or subscribe to updates for any changes.
- resolved Jan 22, 2026, 08:18 PM UTC
The issue causing authentication failures on our DUO4 deployment has been resolved.