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Outage in Microsoft Azure OpenAI

Multi-service impact in Switzerland North

Resolved Minor
September 27, 2025 - Started 7 months ago - Lasted 7 months

Incident Report

Summary AI Generated

A deployment error introduced a malformed certificate prefix in Switzerland North starting at 23:54 UTC on September 26, 2025, causing service unavailability and degraded performance across multiple Azure services including Virtual Machines, Azure OpenAI, Storage Accounts, and other regional resources. Virtual Machines were shut down to preserve data integrity due to the connectivity issues. Microsoft identified the faulty deployment and initiated a rollback to restore normal service, with full mitigation expected by 05:30 UTC.

Impact Statement: Starting at 23:54 UTC on 26 September 2025, customers in Switzerland North may experience service unavailability or degraded performances for resources hosted in the region. Virtual Machines may have shutdown to preserve data integrity. Current Status: We were alerted to this issue by our telemetry informing us in a significant drop in traffic. It was discovered that a recent deployment introduced a malformed prefix in one of the certificates used for connection authorization. We have pinpointed the deployment error involving the certificate prefix and are rolling back the faulty deployment to restore normal traffic flow and service availability.We are seeing success and will continue to monitor traffic and service stability to ensure full recovery, at this stage we expect to fully mitigate by 05:30 UTC.
Components affected
Microsoft Azure OpenAI Azure Container Apps Microsoft Azure OpenAI Switzerland North Microsoft Azure OpenAI App Service Microsoft Azure OpenAI Azure Database for PostgreSQL flexible servers Microsoft Azure OpenAI Azure Databricks Microsoft Azure OpenAI Azure Data Explorer Microsoft Azure OpenAI Azure Kubernetes Service (AKS) Microsoft Azure OpenAI Storage Accounts Microsoft Azure OpenAI Virtual Machines Microsoft Azure OpenAI Virtual Machine Scale Sets Microsoft Azure OpenAI Azure Arc-enabled servers Microsoft Azure OpenAI Azure SignalR Service Microsoft Azure OpenAI Azure IoT Hub Microsoft Azure OpenAI Azure OpenAI Service Microsoft Azure OpenAI Azure Resource Manager Microsoft Azure OpenAI *Non-Regional Microsoft Azure OpenAI Azure VMware Solution Microsoft Azure OpenAI Azure Data Factory Microsoft Azure OpenAI App Service (Linux) Microsoft Azure OpenAI Azure functions

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