Shanghai IV and Shanghai VI Datacenter Issue

Zscaler has detected an issue with its Shanghai IV, Shanghai VI datacenter and is currently investigating the matter. Customers may experience intermittent disconnects, authentication failures, degraded performance, or increased latency when accessing international destinations. If you’re currently experiencing any traffic impacting issues please failover to your secondary DC. For more information, please refer to the following support article. 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 additional details will be posted there as they become available.Latest Update - Fri, 06 Feb 2026 08:07:33 UTCZscaler has received an update from the partner that the submarine cable has been repaired, and we’re seeing improved connectivity across all data centers with reduced packet loss and positive customer feedback. We will continue to monitor the situation to ensure stability.Update - Tue, 03 Feb 2026 09:16:38 UTCZscaler has isolated the ongoing issue to submarine cable repairs, which are outside the control of both Zscaler and our partner. As a result, an estimated time to restoration (ETR) is not available at this time. Further updates will be shared as they become available.Update - Tue, 03 Feb 2026 10:56:37 UTCZscaler has isolated the issue to congestion and ongoing submarine cable repairs impacting the forward path from customers to the Zscaler data centers. Customers can work with their ISP/carrier to reroute traffic and bypass the impacted path where possible while repairs are in progress.Update - Thu, 05 Feb 2026 16:25:15 UTCZscaler continues to work with our carrier partner. At this time, there is no new update to share regarding the congestion/submarine cable repairs, and we will continue to follow up with the carrier. Where possible, customers may also work with their ISP/carrier to explore rerouting options to bypass the impacted path and associated congestion while repairs are in progress.Update - Fri, 06 Feb 2026 08:07:33 UTCZscaler has received an update from the partner that the submarine cable has been repaired, and we’re seeing improved connectivity across all data centers with reduced packet loss and positive customer feedback. We will continue to monitor the situation to ensure stability.