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Outage in Alibaba Cloud

Partial Cloud Service Disruption in Korea (Seoul) Zone B

Resolved Major
April 21, 2026 - Started 2 days ago - Lasted 4 minutes

Incident Report

Summary AI Generated

A cooling system anomaly at Alibaba Cloud's Korea Zone B data center caused disruptions to Elastic Compute Service (ECS), Apsara File Storage NAS, and Elastic Block Storage (EBS) services. Engineers executed emergency shutdown procedures to protect affected cloud products and began migration operations. The cooling system was progressively restored, power was recovered, and cloud services underwent phased restoration.

Dear Customer,At 20:06 (Beijing Time) on April 21, 2026, Alibaba Cloud CloudMonitor detected an anomaly in the cooling system of a data center suite in Korea Zone B. Our engineers have initiated the emergency response pre-plan and are performing migration and shutdown operations on affected cloud products. During this process, some cloud services may experience disruptions. Please closely monitor your business recovery status. Should you have any questions or require assistance, please do not hesitate to contact us.Alibaba Cloud

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Latest Updates ( sorted recent to last )
2 days ago - at 04/21/2026 09:44PM

At 05:38, following power restoration in the data center, network equipment has been prioritized for recovery and is now operational. Affected cloud services are currently undergoing phased restoration.

2 days ago - at 04/21/2026 08:52PM

At 03:56 (UTC+8) on April 22, 2026, the data center cooling system has been progressively restored to operation, and ambient temperatures are returning to normal levels. Alibaba Cloud engineers will maintain continuous monitoring of equipment status and proceed with subsequent recovery activities.

2 days ago - at 04/21/2026 02:53PM

22:25 Alibaba Cloud engineers have executed shutdown protection operations on the affected cloud products in accordance with the emergency response plan. The cooling system anomaly is currently being urgently handled by Alibaba Cloud engineers. We will keep you updated with any latest developments.

2 days ago - at 04/21/2026 02:01PM

Dear Customer,At 20:06 (Beijing Time) on April 21, 2026, Alibaba Cloud CloudMonitor detected an anomaly in the cooling system of a data center suite in Korea Zone B. Our engineers have initiated the emergency response pre-plan and are performing migration and shutdown operations on affected cloud products. During this process, some cloud services may experience disruptions. Please closely monitor your business recovery status. Should you have any questions or require assistance, please do not hesitate to contact us.Alibaba Cloud

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