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
Los Angeles II Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net, zscalertwo.net, zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be enabling IPv6 at our Los Angeles II (QLA2) Data Center. During the maintenance window the services through QLA2 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 5, 6:00 pm PDT (May 6, 1:00 UTC)End time is May 5, 11:00 pm PDT (May 6, 6:00 UTC)
Zscaler will be enabling IPv6 at our Hyderabad I (HYD1) Data Center. During the maintenance window the services through HYD1 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 4, 9:00 am PDT (May 4, 16:00 UTC)End time is May 4, 2:00 pm PDT (May 4, 21:00 UTC)
Los Angeles I Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net, zscalertwo.net, zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be enabling IPv6 at our Los Angeles I (QLA1) Data Center. During the maintenance window the services through QLA1 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 4, 9:00 pm PDT (May 5, 4:00 UTC)End time is May 5, 3:00 am PDT (May 5, 10:00 UTC)
Manchester I (MAN1) Datacenter Network Maintenance - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com, zpatwo.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be performing hardware maintenance in the Manchester I (MAN1) Datacenter.Maintenance window,Start: 2026-05-06 23:00 BSTEnd: 2026-05-07 03:00 BST(i.e. 2026-05-06 22:00 - 2026-05-07 02:00 UTC)During the maintenance, traffic will failover to redundant devices in the same datacenter. However, intermittent connections and connection reestablishment may be observed.
Hong Kong III Datacenter Scheduled Maintenance – IPv6 Enablement - zscalertwo.net, zscalerthree.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 1, 9:00 am PDT (May 1, 16:00 UTC)End time is May 1 2:00 pm PDT (May 1, 21:00 UTC)
Cellular Portal Migration to Experience Center - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com, zdxcloud.net, zpatwo.net, zslogin.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler Cellular Portal is Being disabled—Move to Experience Center by May 15, 2026What is changing?Effective May 15, 2026, Zscaler is disabling the Zscaler Cellular Portal at https://admin.ztsim.com. After this date, the Zscaler Cellular Portal will no longer be available for managing or monitoring Zscaler Cellular services.To continue administering and gaining visibility into Zscaler Cellular services, customers must use Zscaler Experience Center at https://console.zsc...
Tokyo IV Datacenter Scheduled Maintenance - Service Expansion - zscalerthree.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 Tokyo IV (TYO4) 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/zscalerthree.net/cenrMaintenance Window:Start time is May 1, 8:00 am PDT (May 1,15:00 UTC)End time is May 1, 2:00 pm P...
Tokyo V Datacenter Scheduled Maintenance - Service Expansion - zscaler.net, zscalerthree.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 Tokyo V (TYO5) 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/zscaler.net/cenrhttps://config.zscaler.com/zscalerthree.net/cenrMaintenance Window:Start time is May 1, 8:00 am PDT (Ma...
Tokyo V Datacenter Scheduled Maintenance - IPv6 Enablement - zscaler.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be enabling IPv6 at our Tokyo V (TYO5) Data Center. During the maintenance window the services through TYO5 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 1, 8:00 pm PDT (May 1,15:00 UTC)End time is May 1, 2:00 pm PDT (May 1, 21:00 UTC)
New Delhi I Datacenter Scheduled Maintenance - IPv6 Enablement - zscalertwo.net, zscloud.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be enabling IPv6 at our New Delhi I (DEL1) Data Center. During the maintenance window the services through DEL1 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 1, 9:00 am PDT (May 1, 16:00 UTC)End time is May 1, 2:00 pm PDT (May 1, 21:00 UTC)
