Zscaler Outage History

Zscaler experienced an issue with their Kuala Lumpur I datacenter that affected APAC region traffic for 1.3 hours. The company recommended users failover to secondary or alternate datacenters to mitigate traffic impact while they investigated and worked to isolate the root cause. The incident was resolved after active troubleshooting efforts to identify and address the underlying problem.

Zscaler experienced an issue with its Mumbai VI datacenter in the APAC region that lasted 3.2 hours. The incident affected traffic routing through that datacenter, requiring users to failover to secondary or alternate datacenters to maintain service. Zscaler investigated and worked to isolate the problem and identify the root cause during the outage period.

Zscaler's Risk360 service experienced a data loading issue that caused computation delays, resulting in outdated or unavailable risk scores and insights displayed in dashboards. The incident affected the Admin UI component and lasted 56.7 hours, though actual security posture and traffic protection remained unaffected. Resolution involved addressing multiple dependencies to restore normal data processing and real-time scoring functionality.

Zscaler experienced issues with their Administration UI and Mobile Admin Portal across multiple clouds (zscaler.net, zscalertwo.net, and zscalerthree.net), causing customers to encounter intermittent slowness, timeouts, and increased latency when accessing these administrative interfaces. The Zscaler team identified the root cause and deployed mitigations progressively across the affected clouds, with testing showing improved service performance. The incident lasted 5.7 hours with mitigations being rolled out in phases, starting with zscaler.net and zscalerthree.net clouds, with completion expected within 45 minutes of the final update.

Zscaler experienced a software defect that prevented some customers from creating new Certificate Signing Requests (CSR) through the administration UI, with the CSR creation option appearing greyed out. The issue affected the Admin UI component and lasted 27.5 hours. Zscaler identified the root cause as a software defect and implemented a fix to restore normal CSR creation functionality.

Zscaler experienced authentication issues affecting customers using IdP-initiated authentication, causing login failures across zscaler.net and zscloud.net Cloud services. The problem was identified as previous mitigation efforts not propagating to a subset of Service Edges. The incident lasted 2.2 hours with teams actively working to restore services after identifying the fix.

Zscaler experienced authentication issues affecting customers using IdP-initiated login, resulting in login failures across zscaler.net and zscloud.net cloud services. The incident impacted the Authentication component and was resolved within 15 minutes.

Zscaler's Private Service Edge (PSE) experienced intermittent traffic blocking issues affecting a subset of customers using explicit proxy traffic, with affected requests returning "Web Application Blocked by Firewall Rule" errors. The incident impacted traffic forwarding functionality and lasted 14.1 hours. Zscaler identified the root cause and implemented mitigation steps to restore normal traffic handling behavior within the data plane.

Zscaler experienced an authentication issue at their Kingdom of Saudi Arabia I datacenter that affected EMEA region services for 33 minutes. Users were advised to failover to secondary or alternate datacenters to mitigate traffic impacts during the incident. The issue was resolved after investigation and monitoring.

Zscaler experienced login issues with their Customer Support Portal (CSP) affecting a subset of customers who encountered "Can't connect to Zscaler Support" error messages when attempting to access the portal. The incident impacted the Admin UI component and prevented affected users from logging into the CSP to manage or create support cases. The issue was resolved after 73.1 hours, with workarounds provided including accessing support through alternative Zscaler product admin interfaces or contacting support via phone.