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Microsoft’s Azure Front Door (AFD) incident on October 9, 2025, disrupted AFD and Azure CDN traffic and made Azure Portal and other Microsoft management portals less available. Microsoft traced it to a control-plane defect and a cleanup operation that allowed erroneous metadata to reach the data plane, where it triggered crashes. The incident is historical: Microsoft reported AFD availability restored by 12:50 UTC and latency back to baseline by 16:00 UTC.
What happened in the Azure Front Door outage?
Tracked by Microsoft as QNBQ-5W8, the incident ran from 07:50 to 16:00 UTC on October 9, 2025. Customers using Azure Front Door and Azure CDN could experience increased latency and timeouts, primarily in Africa and Europe, as well as in Asia Pacific and the Middle East. The disruption also affected access to Azure Portal and other Microsoft management portals.
Microsoft reported approximate peak AFD failure rates of 17% in Africa, 6% in Europe, and 2.7% in Asia Pacific and the Middle East. These are regional failure-rate figures, not percentages of customers or requests. Microsoft also said approximately 26% of AFD data-plane infrastructure resources in Europe and Africa were impacted.
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Microsoft attributed the incident to a defect in a newer AFD control-plane version and an erroneous tenant-metadata cleanup sequence. AFD’s control plane generates metadata used by the data plane when customers create, update, or delete AFD or CDN profiles. A particular sequence of profile updates had produced erroneous metadata, and automated protection initially blocked affected updates.
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During cleanup, Microsoft temporarily bypassed that protection to correct tenant configuration. The erroneous metadata then propagated to later stages and activated a data-plane bug that crashed resources at edge sites. Microsoft said the control-plane version containing the defect had been rolled out six weeks before the incident under its safe deployment practices.
How the impact spread
The crashes affected a significant number of edge sites in Europe and Africa. AFD shifted traffic to nearby sites, including sites in Asia Pacific and the Middle East. Increased demand during regional business hours added pressure; load on remaining healthy sites exceeded operational thresholds and led to broader traffic distribution.
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Incident timeline
| Time (UTC), October 9, 2025 | What Microsoft reported |
|---|---|
| 07:30 | Tenant-metadata cleanup operation began. |
| 07:50 | Customer impact began. |
| 08:13 | Telemetry detected resource-availability loss across multiple AFD edge sites. |
| 09:04 | Microsoft identified the data-plane bug behind the crashes. |
| 09:08 | Automated restarts and manual recovery began. |
| 09:15 | Customer impact reached its peak. |
| 10:01 | Microsoft posted an update to the Azure Status page. |
| 10:45 | Targeted communications went out through Azure Service Health. |
| 11:59 | Management portals, including Azure Portal, performed failover operations to help restore availability. |
| 12:50 | AFD availability had recovered, although some customers could still see elevated latency. |
| 16:00 | Latency had returned to baseline; Microsoft declared the incident mitigated. |
The overall incident window describes the service event, not the downtime experienced by any one customer. Actual impact varied by customer and resource.
How did Microsoft recover service?
Microsoft used automated restarts and manual intervention when restarts were too slow. Management portals also failed over traffic to help restore access. AFD availability recovered before latency fully returned to baseline, which Microsoft reported at 16:00 UTC.
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What did Microsoft say it would change?
Microsoft’s incident review marks three corrective actions complete: hardening procedures so the configuration-protection system is not bypassed for operations, fixing the control-plane defect that generated erroneous metadata, and fixing the data-plane bug.
The same review listed additional actions with estimated completion dates. Those estimates are not confirmation that the work was later completed.
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| Action listed in the incident review | Estimated completion in the review | Status established by that review |
|---|---|---|
| Broader automated Azure Service Health alerts for similar degradation | November 2025 | Estimated, not confirmed complete |
| More robust and automated Azure Portal failover from AFD | December 2025 | Estimated, not confirmed complete |
| Runtime configuration validation using a replica of the real-time data plane | March 2026 | Estimated, not confirmed complete |
| Faster recovery of data-plane resource instances | March 2026 | Estimated, not confirmed complete |
How can you prepare for an Azure Front Door outage?
Microsoft’s recommendations focus on designing for failure and ensuring you can detect service impact rather than assuming every application will experience the same symptoms.
- Plan an alternate route: Consider Azure Traffic Manager failover from AFD to your origins. Define which failures should trigger a route change and how the alternate path will be validated.
- Use retry logic: Implement retries with exponential backoff so transient failures do not immediately become repeated bursts of traffic.
- Review resilience: Apply Microsoft’s Azure Front Door architecture best practices and assess application reliability with the Azure Well-Architected Framework.
- Monitor customer impact: Use granular monitoring to identify which application functions, regions, and resources are affected.
- Enable personalized alerts: Configure Azure Service Health alerts for relevant subscriptions and services.
- Test recovery independently: Exercise the failover path and recovery procedures before an incident, including how routing changes are triggered and how the application behaves when traffic reaches the origin.
These choices address different failure modes and have different operational demands. The PIR recommends origin failover, architecture practices, and retries, but does not quantify performance or cost for a particular customer’s design.
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Where should you check Azure service status?
Microsoft distinguishes the public Azure status page from Azure Service Health. The public page provides broad service-health information and is used for specified broad-impact situations, including cases that impede access to Azure Portal or Service Health when Microsoft cannot reach customers through its standard path. Azure Service Health provides personalized information about outages, planned maintenance, and advisories relevant to your environment. Details are in Microsoft’s Azure Status Overview.
For incident-specific details, Microsoft’s Azure status history and Azure Service Health documentation explain status reporting and notifications.
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