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OutageResolvedAzure status historyCentral US

Storage unavailability in Central US impacting Virtual Machines and dependent services

Started

Jul 18, 2024, 9:56 PM UTC

Resolved

Jul 19, 2024, 12:00 PM UTC

Duration

14h 4m

Service

Azure Storage

Source: Azure status historyLast verified 23 days agoVerify on the official source

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Impact

An allowlist configuration error on Azure Storage scale units made storage unavailable across an availability zone in Central US, taking down Virtual Machines and dependent services (including Microsoft 365) for many hours.

Affected service

Azure Storage

Affected regions

Central US

Timeline

Updates newest first (times in UTC).

  1. Resolved

    Virtual machine recovery substantially complete; residual service-specific impact addressed individually.

  2. Monitoring

    Storage availability restored; Virtual Machines and dependent services recovering as compute recovers state.

  3. Mitigating

    A configuration change to storage scale units identified as the trigger; the change is being backed out and storage partitions brought back online.

  4. Investigating

    Investigating storage and Virtual Machine availability failures in the Central US region.

Resolution

Virtual machine recovery substantially complete; residual service-specific impact addressed individually.

Related reading

Entra ID

Azure AD Outage (March 15, 2021): A Key Rotation Bug That Locked Out the World

Entra ID

Azure MFA Outage (November 19, 2018): When the Second Factor Locked Everyone Out

Azure Storage

Azure South Central US Outage (September 4, 2018): When a Lightning Strike Took Out a Datacenter

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