All Deployments - Entra 504 Gateway Timeouts
This summary is created by Generative AI and may differ from the actual content.
Overview
On February 23, 2026, US-based users utilizing the Duo integration with Azure Identity management experienced increased authentication failures and timeouts when accessing applications using Microsoft Entra and Duo as the MFA provider.
Impact
The incident affected multiple Duo services, resulting in 504 gateway timeouts for users accessing applications using Microsoft Entra and Duo as the MFA provider.
Trigger
A software update deployed to the backend service that supports the Duo integration with Azure Identity management, which introduced increased CPU utilization per request.
Detection
Duo engineering was alerted to the issues via monitoring at 9:15 AM and promptly began investigating various factors that could have caused this error to occur.
Resolution
The incident was remediated by scaling the backend services that support this integration, and additional resources have been added to the infrastructure powering this backend service to provide additional compute headroom.
Root Cause
The root cause of the incident was increased CPU utilization resulting from a code change that added additional validation for security operations, which was not identified by existing performance tests and monitoring.