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.
May 2026
Helsinki I Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net, zscalertwo.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be enabling IPv6 at our Helsinki I (HEL1) Data Center. During the maintenance window the services through HEL1 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 May 22, 9:00 am PDT (May 22, 16:00 UTC)End time is May 22, 2:00 pm PDT (May 22, 21:00 UTC)
Helsinki I Datacenter Scheduled Maintenance - Service Expansion - zscloud.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be expanding its global data center footprint and performing maintenance at our Helsinki I (HEL1) data center. We expect minimal to no impact to services during the maintenance window. Please update your firewall policy rules and any upstream Access Control Lists to allow all IP addresses for this DCFor more information, please visit:https://config.zscaler.com/zscloud.net/cenrMaintenance Window:Start time is May 22, 9:00 am PDT (May 22, 16:00 UTC)End time is May 22, 2:00 pm PDT ...
Hong Kong III Datacenter Scheduled Maintenance – IPv6 Enablement - zscaler.net, zscloud.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will perform scheduled maintenance at our Hong Kong III (HKG3) Data Center to complete preparatory work for future IPv6 enablement. During the maintenance window, services through the HKG3 Data Center may be restarted in phases to minimize impact.Other Zscaler sites and services will continue to operate normally.Maintenance Window:Start time is May 20, 9:00 am PDT (May 20, 16:00 UTC)End time is May 20, 4:00 pm PDT (May 20, 23:00 UTC)
Zscaler will be enabling IPv6 at our Capetown IV (CPT4) Data Center. During the maintenance window the services through CPT4 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 May 19, 9:00 am PDT (May 19, 16:00 UTC)End time is May 19, 4:00 pm PDT (May 19, 23:00 UTC)
Mexico City I Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be enabling IPv6 at our Mexico City I (MEX1) Data Center. During the maintenance window the services through MEX1 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 May 18, 6:00 pm PDT (May 19, 1:00 UTC)End time is May 18, 11:00 pm PDT (May 19, 6:00 UTC)
Zscaler is investigating an issue affecting a subset of customer IPsec tunnels. Issue is limited to new tunnel creation. Our team is actively working on resolution, and we will provide further updates as more information becomes available.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.Root Cause- The issue occurred due to a synchronization discrepan...
Zscaler Client Connector-Based End User Notifications Issue - zscalerthree.net
Source not attested
Last archived state: investigating
View archived record details
investigating
Zscaler has detected an issue with Zscaler Client Connector-Based End User Notifications on its zscalerthree.net Cloud. 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 - Sat, 16 May 2026 19:40:20 UTCZscaler has completed the primary investigation regarding the is...
Scheduled Maintenance Extended - EMEA Region - zscloud.net
minorSource not attested
Last archived state: resolved
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resolved
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, 15 May 2026 01:25:55 UTCThis activity has ...
Urgent Maintenance - zscalerone.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 zscalerone.net cloud. This maintenance is scheduled for Friday at 01:00 AM Pacific Time on May 15, 2026 (Friday, May 15, 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 updates t...
RI CCS Test - zscaler.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler has detected an issue with PAC file serving on its zscaler.net Cloud. 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.
