- Level
- confirmed
- Worst impact
- Degraded
- Components
- Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service
- Regions
- us
- Down Index
- 22of 100
What to do
Check whether you use Duo Security Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service and 19 more in us. Check your stack
Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.Confirm your retries, queues and scheduled jobs caught up after the 1h 20m it lasted.
Anything that failed between 2026-09-03 22:04 UTC and 2026-09-03 23:24 UTC may need a replay.Subscribe to Duo Security's feed to hear about the next one first. RSS feed
https://down.guide/feed?provider=duo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.
Updates from Duo Security 3
- investigating
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.
provider
- monitoring
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.
provider
- resolved
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.
provider
Reports count in aggregate; nothing about you is shown.
Corrections
None so far.
Something wrong on this page? Report an error or send us a note. Every fix is listed here.
Questions about DWN-c4e302730a
Is Duo Security still down?
No, this incident was resolved 2026-09-03 23:24 UTC. For Duo Security's live state, see https://down.guide/duo.
How long did it last?
1h 20m, from 2026-09-03 22:04 UTC to 2026-09-03 23:24 UTC, by the times Duo Security posted.
What was affected?
Duo Security named Core Authentication Service, Core Authentication Service, Core Authentication Service, Core Authentication Service and 19 more in us.
What caused it?
Duo Security hasn't published a root cause. If it does, it shows here.
Where does this come from?
Duo Security's official status page, https://status.duo.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.