Provider resolved: . The notice publication date does not establish the outage start.
resolved
Following the actions previously taken by Zscaler, the incident has been resolved.
Root Cause: Preliminary root cause is attributed to an internal backend infrastructure issue, which has since been fully resolved.
Following the actions previously taken by Zscaler, the incident has been resolved.
Provider resolved: . The notice publication date does not establish the outage start.
resolved
Following the actions previously taken by Zscaler, the incident has been resolved. Our systems remain fully operational, and we will continue to monitor the situation closely to ensure ongoing stability.
Provider resolved: . The notice publication date does not establish the outage start.
resolved
Following the actions previously taken by Zscaler, the incident has been resolved. Our systems remain fully operational, and we will continue to monitor the situation closely to ensure ongoing stability.
Provider resolved: . The notice publication date does not establish the outage start.
resolved
Services have recovered following remediation of a network configuration issue by our infrastructure partner. We are continuing to monitor the environment to ensure stability.
Provider resolved: . The notice publication date does not establish the outage start.
resolved
Following the actions previously taken by Zscaler, the incident has been resolved. Our systems remain fully operational, and we will continue to monitor the situation closely to ensure ongoing stability.
Provider resolved: . The notice publication date does not establish the outage start.
resolved
Following the actions previously taken by Zscaler, the incident has been resolved. Our systems remain fully operational, and we will continue to monitor the situation closely to ensure ongoing stability.
Tokyo IV and Tokyo V Data Center Issue - zscalerthree.net
Provider resolved: . The notice publication date does not establish the outage start.
resolved
The performance issue has been resolved. The degradation was observed between 0800–1000 Japan time following resumption of business activity post a holiday period, and recovered without any intervention. The environment is confirmed stable.
Legacy Incident Archive
453 archived records restored. These records predate source-at-observation attestation. They are shown as historical ServiceAlert records only and do not establish a provider-reported incident, resolution, duration, or current active state.
April 2026
Atlanta II Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net, zscalertwo.net, zscloud.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be enabling IPv6 at our Atlanta II (ATL2) Data Center. During the maintenance window the services through ATL2 Data Center will be restarted in phases to minimize the service impact.Other Zscaler sites and Zscaler Services will continue to operate normally.Maintenance Window:Start time is April 16, 6:00 pm PDT (April 17, 1:00 UTC)End time is April 17, 12:00 am PDT (April 17, 7:00 UTC)
Zscaler will be enabling IPv6 at our Auckland II (AKL2) Data Center. During the maintenance window the services through AKL2 Data Center will be restarted in phases to minimize the service impact.Other Zscaler sites and Zscaler Services will continue to operate normally.Maintenance Window:Start time is April 16, 6:00 am PDT (April 16, 13:00 UTC)End time is April 16, 11:00 am PDT (April 16, 18:00 UTC)
Boston I Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be enabling IPv6 at our Boston I (BOS1) Data Center. During the maintenance window the services through BOS1 Data Center will be restarted in phases to minimize the service impact.Other Zscaler sites and Zscaler Services will continue to operate normally.Maintenance Window:Start time is April 15, 6:00 pm PDT (April 16, 13:00 UTC)End time is April 15, 11:00 pm PDT (April 16, 18:00 UTC)
Zscaler will be enabling IPv6 at our Amsterdam III (AMS3) Data Center. During the maintenance window the services through AMS3 Data Center will be restarted in phases to minimize the service impact.Other Zscaler sites and Zscaler Services will continue to operate normally.Maintenance Window:Start time is April 15, 1:30 pm PDT (April 15, 20:30 UTC)End time is April 15, 6:30 pm PDT (April 16, 1:30 UTC)
Tokyo IV Datacenter Scheduled Maintenance - IPv6 Enablement - zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be enabling IPv6 at our Tokyo IV (TYO4) Data Center. During the maintenance window the services through TYO4 Data Center will be restarted in phases to minimize the service impact.Other Zscaler sites and Zscaler Services will continue to operate normally.Maintenance Window:Start time is April 14, 9:00 pm PDT (April 14, 16:00 UTC)End time is April 14, 2:00 pm PDT (April 14, 21:00 UTC)
Zscaler will be performing hardware maintenance in Denver III (DEN3) Datacenter .Maintenance window: Start: 2026-04-13 05:00 UTC End: 2026-04-13 08:00 UTC (Local Time 2026-04-12 23:00 - 2026-04-13 02:00)Update - Mon, 13 Apr 2026 06:03:07 UTCThis activity has been completed. Please contact Zscaler Support if you have additional questions.
Scheduled Maintenance Extended - EMEA Region - zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
The Zscaler Site Reliability Engineering team will be extending the scheduled maintenance of the EMEA region's datacenters on zscloud.net cloud by 3 hours. During this extended maintenance window the ZIA Admin Portal, including policy management and reporting access, and new user authentication should be successful. As part of our standard maintenance process, all logs will be collected and available after maintenance has been completed.Update - Fri, 10 Apr 2026 01:49:29 UTCThis activity has ...
China Premium Access Plus Beijing V and Shanghai VI Datacenter Network Maintenance - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
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investigating
Beijing V and Shanghai VI DC network providers have advised maintenance work as below. During the maintenance window, China Premium Access Plus services within these data centres may experience intermittent disconnections.Start Time: 2026-06-05 16:00:00 UTCEnd Time: 2026-06-05 20:00:00 UTC(Datacenter Local Time 2026-06-06 00:00 - 2026-06-06 04:00 China Standard Time (UTC+8:00))Reason of Maintenance: Provider advised maintenance.Impact During Maintenance: Intermittent connectivity might ...
Urgent Maintenance - zscalerone.net
majorSource not attested
Last archived state: investigating
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investigating
The Zscaler Site Reliability Engineering team will be performing an urgent maintenance on zscalerone.net cloud. This maintenance is scheduled for Friday at 01:00 AM Pacific Time on April 10, 2026 (Friday, April 10, 2026 08:00 AM UTC), and can take up to 4 hours to complete.During maintenance, which includes the control plane, the Admin Portal might be temporarily placed into read-only mode, making the following unavailable: configuration changes, new user provisioning, and existing user updat...
Urgent Maintenance - zdxcloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
The Zscaler Site Reliability Engineering team will be performing an urgent maintenance on the zdxcloud.net cloud. This maintenance is scheduled for Thursday at 03:00 PM Pacific Time on April 9, 2026 (Thursday, April 9, 2026 10:00 PM UTC), and can take up to 2 hours to complete.During this maintenance window the ZDX Admin Portal, including policy management, reporting access, and authentication of new users will not be available. As part of our standard maintenance process all logs will be col...
