Posted on: Wed, 05 Nov 2025 16:49:39 UTC
Resolved on: Thu, 06 Nov 2025 22:43:54 UTC
Impact Start Time: Wed, 05 Nov 2025 16:49:15 UTC
Impact Remediated: Thu, 06 Nov 2025 22:44:00 UTC
ZPA Diagnostic logs Issue
Customer Impact: Impacted customers may observe intermittent gaps or delays in dashboard telemetry and log visibility. Core traffic flows remain unaffected.
Status: Resolved
Event Type: Service Degradation

Zscaler has detected an issue impacting the private.zscaler.com Cloud in the US region (US3 Logging zone). A subset of customers in the impacted environments may observe the following:

Diagnostics dashboards may show incomplete / partial data.
Alerts tied to these components may trigger false positives.
Nanolog-enabled dashboards may experience intermittent timeouts.
Note: Customers that in US1, US2, US4, US5 logging zone in the US region will see no impact.

There is no impact to live traffic. ZCC enrollment and ZPA logins remain fully functional, and all production services continue to operate normally. We will continue to publish updates here as the investigation progresses. Additional details — including status changes — will be shared as they become available.

Incident Status: Resolved
Root Cause: The service degradation was caused by an unexpected increase in log processing activity within the logging backend. This resulted in delayed availability of logs until corrective adjustments were applied and normal processing behavior was restored.

Update - Wed, 05 Nov 2025 18:05:37 UTC

Zscaler has isolated the underlying cause affecting telemetry visibility within the impacted cloud. Mitigation work is in progress to restore complete dashboard data fidelity. We will continue to publish updates here as mitigation progresses or as additional material information becomes available.

Update - Wed, 05 Nov 2025 22:29:41 UTC

Zscaler has implemented the required mitigation steps across the impacted environments. Two of the affected environments are already restored, and the final environment is actively progressing mitigation. Zscaler is monitoring closely to ensure stability and sustained service availability.

Update - Thu, 06 Nov 2025 14:25:52 UTC

Zscaler has implemented the required mitigation steps across the impacted environments. Two of the affected environments have already been restored, while mitigation efforts for the final environment are still actively progressing. Zscaler continues to closely monitor the situation to ensure stability and sustained service availability.

Update - Thu, 06 Nov 2025 22:43:54 UTC

Service availability has been fully restored. Zscaler has applied the required mitigation across all affected environments, and our monitoring confirms normal operations.