Kuala Lumpur I, Seoul I, Singapore IV, Singapore V, Tokyo IV, Tokyo V Datacenter Issue

Zscaler is currently investigating reports of an issue with its Kuala Lumpur I, Seoul I, Singapore IV, Singapore V, Tokyo IV, Tokyo V datacenter. We will continue to provide updates here as the investigation progresses. For detailed updates, please check the Service Status section in your Zscaler customer support portal (CSP). Status changes and updates will be posted there as they become available.Latest Update - Fri, 09 Jan 2026 11:08:10 UTCZscaler continues to monitor the situation and will provide an update only when there is a substantive change to share.Update - Wed, 07 Jan 2026 11:56:17 UTCThe Zscaler team has identified the issue as related to a downstream network path and has implemented mitigations while engaging the relevant partner for further investigation. Zscaler teams are actively prioritizing the incident, evaluating additional mitigation options, and working to restore service for all affected traffic.Update - Wed, 07 Jan 2026 15:47:40 UTCThe Zscaler team has identified the issue and is actively working on mitigation efforts. The team is prioritizing the incident, evaluating multiple mitigation options, and working diligently to restore services.Update - Wed, 07 Jan 2026 23:59:34 UTCMitigation actions, including traffic rerouting, have been implemented by the external cloud partner and continue to be worked on. Service performance is showing improvement, and monitoring remains in place. We are awaiting further updates and will share additional information as it becomes available.Update - Thu, 08 Jan 2026 03:38:33 UTCMitigation actions, including traffic rerouting, have been implemented by the external cloud partner. Service performance is showing improvement, and monitoring remains in place to ensure stability. We are awaiting further updates and will share additional information as it becomes available.Update - Thu, 08 Jan 2026 11:59:34 UTCZscaler services remain fully operational; however, some users may experience performance issues when transmitting traffic between the impacted data centers and U.S.-based app connectors or SaaS applications in both directions. The disruption is due to multiple undersea fiber cuts in the region, which are impacting downstream transit providers that serve the affected data centers. These subsea cable issues, caused by physical damage outside of Zscaler’s control, are affecting many providers across the region. Zscaler teams are actively working to mitigate the impact by: Coordinating with global carriers to reroute and optimize traffic paths.Collaborating with cloud providers to enhance performance.Monitoring network conditions to make real-time adjustments. Repair operations on the damaged cables are being scheduled, but timelines for completion remain uncertain. We will continue to share updates as more information becomes available. If you are experiencing persistent issues, switching to an alternative Zscaler data center may improve performance. For detailed updates, please check the Service Status section in your Zscaler customer support portal (CSP).Update - Fri, 09 Jan 2026 11:08:10 UTCZscaler continues to monitor the situation and will provide an update only when there is a substantive change to share.