Microsoft Azure outage, 29 October 2025

Azure Front Door global configuration outage (29 October 2025). The disruption lasted about 8 hours 24 minutes, according to Microsoft Azure’s own timeline.

What happened. A sequence of valid customer configuration changes made across two control-plane build versions produced incompatible metadata that exposed a latent data-plane bug. Because the crash happened asynchronously, the config passed health-gated rollout stages and ‘last known good’ snapshot, then crashed edge servers globally.

What changes. Microsoft fixed the incompatibility and data-plane bug, now fully processes each config synchronously before production stages, and added rollout stages with longer bake time.

Questions

What caused the Microsoft Azure outage in October 2025?

A sequence of valid customer configuration changes made across two control-plane build versions produced incompatible metadata that exposed a latent data-plane bug.

Which services were affected?

Azure Front Door, Azure CDN, Azure Portal, App Service, SQL Database and more; Microsoft 365, Entra ID, Dynamics 365, Power Platform.

Read how shared dependencies spread a failure in why one cloud outage can break unrelated apps, or browse the outage archive.