Provider resolved: . The notice publication date does not establish the outage start.
resolved
Zscaler teams have successfully deployed the fix during the planned maintenance window. Post-deployment sanity validation has been completed with successful results, and the service remains stable.
Increased CAPTCHA Challenges During Web Access - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net
Provider resolved: . The notice publication date does not establish the outage start.
resolved
The increased Google CAPTCHA activity has subsided, and this incident is resolved. The investigation linked the repeated challenges to Google’s automated traffic detection. No contributing changes to Zscaler services were identified. A subset of users experienced repeated CAPTCHA prompts when accessing Google services or websites using Google CAPTCHA, interrupting searches and related workflows. Customers who continue to encounter Google CAPTCHA prompts should review Avoiding Google CAPTCHA...
Miami III, Miami IV Datacenter Issue - zscalertwo.net, zscalerthree.net
Provider resolved: . The notice publication date does not establish the outage start.
resolved
Zscaler has isolated the connectivity degradation affecting Miami III and Miami IV to congestion on external ISP network paths. Corrective action is required from the relevant service provider. This incident notification is now closed. Customers experiencing continued impact should contact their ISP to request path optimization. Connecting through an alternate data center may help mitigate the impact; please validate connectivity after failover. Contact Zscaler Support if further assistance i...
Intermittent Connectivity Issues Affecting Plain UDP Tunnels for Branch Connectors and Cloud Connectors in APAC - zscloud.net
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
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
Zscaler has completed post-deployment monitoring and confirmed that all affected services are functioning as expected. Based on continued stability and healthy service checks, we are marking this incident as 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.
update
We are receiving positive feedback from multiple customers indicating service recovery. Our teams continue to closely monitor services and will provide further updates as more information becomes available.
update
We have reverted the contributing configuration change and implemented additional adjustments to improve service capacity on ZS2. We are currently validating these changes and monitoring recovery for Zscaler Client Connector sign-in/registration and Mobile Admin Portal access. We will provide another update as validation completes or if service status changes.
update
We are continuing to investigate an issue impacting Zscaler Client Connector sign-in/registration and access to the Mobile Admin Portal for a subset of users on ZS2. Initial mitigation actions did not fully restore service. We identified a contributing configuration change that reduced service capacity for the Mobile Admin Portal on ZS2, which led to intermittent access issues for some users. Our teams are reverting the change and actively applying additional remediation steps to recover affected services. We are monitoring recovery and will provide further updates as more information becomes available.
update
We are investigating an issue impacting Zscaler Client Connector sign-in/registration and access to the Mobile Admin Portal for a subset of users on ZS2. Mitigation actions have been applied and we are now monitoring the service. We will provide another update as more information becomes available.
update
We have identified the root cause of the issue and working on resolution.
update
Zscaler has detected an Authentication issue with the Zscaler Client Connector Portal and Zscaler Client Connector (ZCC) on its zscalertwo.net Cloud. Some users may see a “Zscaler Client Connector was unable to enroll at this time” message when trying to sign in to Zscaler Client Connector (ZCC). Users who are already signed in should continue to access services normally.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.
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
Amsterdam II (AMS2) Data Center Issue - zscaler.net, zscalertwo.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler has detected an issue with its Amsterdam II data center and is currently investigating the matter. If you’re currently experiencing any traffic impacting issues please failover to your secondary DC or any other alternate DC. For more information, please refer to the following support article. 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). Statu...
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 Wednesday at 08:00 PM Pacific Time on May 6, 2026 (Thursday, May 7, 2026 03:00 AM UTC), and can take up to 3 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 collec...
Shanghai VI Data Center Issue - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler has detected an issue with its Shanghai VI datacenter and is currently investigating the matter. If you’re currently experiencing any traffic impacting issues please failover to your secondary DC or any other alternate DC. For more information, please refer to the following support article. 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 ...
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 Thursday at 02:30 PM Pacific Time on May 7, 2026 (Thursday, May 7, 2026 09:30 PM 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...
Hong Kong III Datacenter Scheduled Maintenance – IPv6 Enablement - zscaler.net, zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
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 7, 9:00 am PDT (May 7, 16:00 UTC)End time is May 7, 4:00 pm PDT (May 7, 23:00 UTC)
Urgent Maintenance Notification – Zero Trust Browser - zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will perform urgent maintenance for the Zero Trust Browser service to update a required Zscaler Internet Access (ZIA) certificate on zscalerthree.net cloud.Maintenance Window:May 6, 2026 | 12:00 AM – 02:00 AM UTCExpected Impact:Existing Zero Trust Browser sessions will not be affected during this maintenance activity. Customers initiating new Zero Trust Browser sessions during the maintenance window may experience brief and intermittent access issues while the certificate update is ...
Capetown IV Datacenter Scheduled Maintenance - IPv6 Enablement - zscalerone.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
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 7, 9:00 am PDT (May 7, 16:00 UTC)End time is May 7, 2:00 pm PDT (May 7, 21:00 UTC)
Sao Paulo IV Datacenter Scheduled Maintenance - Service Expansion - zscalertwo.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be expanding its global data center footprint and performing maintenance at our Sao Paulo IV (SAO4) 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/zscalertwo.net/cenrMaintenance Window:Start time is May 5, 6:00 pm PDT (May 6, 1:00 UTC)End time is May 5, 11:00 p...
Sao Paulo IV Datacenter Scheduled Maintenance - IPv6 Enablement - zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be enabling IPv6 at our Sao Paulo IV (SAO4) Data Center. During the maintenance window the services through SAO4 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)Update - Wed, 06 May 2026 07:09:06 UTCThis activity has been completed. Please contact Zscaler Suppor...
Kuala Lumpur II (KUL2) 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 Kuala Lumpur II (KUL2) Datacenter.Maintenance window,Start: 2026-05-06 04:00 GMT+8End: 2026-05-06 06:00 GMT+8(i.e. 2026-05-06 20:00 - 22:00 UTC)During this maintenance, traffic will failover to redundant devices in the same datacenter, and we expect no service impact. Update - Wed, 06 May 2026 21:11:55 UTCThis activity has been completed. Please contact Zscaler Support if you have additional questions.
