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OutageResolvedAzure status historyGlobal

DNS resolution failures during planned DNS migration

Started

May 2, 2019, 7:29 PM UTC

Resolved

May 2, 2019, 10:35 PM UTC

Duration

3h 6m

Service

Azure DNS

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

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Impact

During a planned DNS migration, a delegation change disrupted Azure DNS name resolution globally, breaking access to Storage, SQL Database, and Microsoft 365 services for roughly three hours.

Affected service

Azure DNS

Affected regions

Global

Timeline

Updates newest first (times in UTC).

  1. Resolved

    DNS resolution restored; residual impact cleared as cached records expired.

  2. Mitigating

    A nameserver delegation change made during a planned DNS migration identified as the cause; corrected delegation is propagating.

  3. Investigating

    Investigating DNS resolution failures affecting connectivity to multiple Azure services, including Storage and SQL Database.

Resolution

DNS resolution restored; residual impact cleared as cached records expired.

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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