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Outage Analyses

Azure AD Outage Analysis: December 15, 2021

By Mike Hicks
| | 1 min read


On December 15, 2021, ThousandEyes detected a widespread Azure Active Directory (AD) outage. The following is an analysis of the outage, which will be updated periodically as we have more information to share.

[Dec 15, 9:30 pm PT]

ThousandEyes detected a widespread Azure Active Directory (AD) outage lasting ~1.5 hours from ~00:50 UTC – 2:25 UTC, which may have impacted users around the globe from signing in to Microsoft services like O365. During the outage, authentication requests were returning HTTP 503 service unavailable errors. Azure reports that it mitigated the issue at around 2:25 UTC by rolling over to redundant infrastructure, which cleared the issue and restored service availability. 

Live link to view the Azure outage in ThousandEyes here. No login required.



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