Microsoft said a bug in its automated maintenance request system mistakenly removed IP routes from too many devices, causing a major outage that disrupted Azure and Microsoft 365 services across the West US region. The incident affected services including SharePoint Online, Microsoft Teams, OneDrive, Microsoft Defender, and others, and Microsoft later rolled back the change and said it will publish a full review. #Microsoft #Azure #Microsoft365 #SharePointOnline #MicrosoftTeams #OneDrive #MicrosoftDefender
Keypoints
- A maintenance bug triggered the outage by removing IP routes from more devices than intended.
- The disruption began at 10:44 AM ET and heavily affected Microsoft 365 customers in the West US region.
- SharePoint Online, Microsoft Teams, OneDrive, and the Microsoft 365 Admin Center were among the impacted services.
- Azure services such as Azure App Service, Azure Kubernetes Service, and Microsoft Graph also experienced failures or delays.
- Microsoft rolled back the change, restored service by 3:41 PM ET, and is reviewing its safety checks and automation.