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.
April 2026
Reminder Notification for Upcoming New DCs and Expansions - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com, zpatwo.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Dear Customer, In accordance with the Zscaler Service Continuity Policy and as previously announced via email notification and Trust on March 3, 2026, we would like to remind you of the upcoming New DCs and expansions at the locations listed below. These would be available anytime on or after May 2, 2026Please update your firewall policy rules and any upstream access lists to allow the new IP address ranges to avoid any service disruption.RegionLocationCIDRNotesAmeric...
Zscaler detected an issue where the existing access token that was generated before April 11 can not be used to deploy Zscaler Client Connector. As a workaround customers can create a new access token while the Zscaler team investigates and fixes the issue. Affected Services: Zscaler Client Connector for VDIWorkaround: - Generate a new access token from the Cloud and Branch Connector portal (Administration > VDI Templates) and use the new token for any new deployments- For non-pe...
Urgent Scheduled Maintenance - zscalerone.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is performing a service upgrade on Saturday at 6:00 AM PDT on April 18, 2026 (Saturday, April 18, 2026 , 01:00 PM UTC), and is expected to last up to 4 hours.During this maintenance period, the Zscaler Client Connector Portal will be in maintenance mode. As a result, access to policy management and reporting will not be available. Existing devices that are already enrolled will not be affected, but there may be intermittent failures in registering new devices. Rest assured, all logs w...
Helsinki I (HEL1) Datacenter Network Maintenance - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be performing hardware maintenance in the Helsinki I (HEL1) Datacenter.Maintenance window,Start: 2026-04-17 21:00 EESTEnd: 2026-04-18 01:00 EEST(i.e. 2026-04-17 18:00 - 22:00 UTC)During this maintenance, traffic will failover to redundant devices in the same datacenter, and we expect no service impact. Update - Fri, 17 Apr 2026 20:03:32 UTCThis activity has been completed. Please contact Zscaler Support if you have additional questions.
Stockholm III (STO3) Datacenter Network Maintenance - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be performing hardware maintenance in the Stockholm III (STO3) Datacenter.Maintenance window,Start: 2026-04-17 20:00 CESTEnd: 2026-04-18 00:00 CEST(i.e. 2026-04-17 18:00 - 22:00 UTC)During this maintenance, traffic will failover to redundant devices in the same datacenter, and we expect no service impact. Update - Fri, 17 Apr 2026 20:05:32 UTCThis activity has been completed. Please contact Zscaler Support if you have additional questions.
Zscaler is currently investigating an issue causing computation delays. Latest risk scores and insights may be outdated or unavailable at this time. During this time, your dashboard may reflect historical data; however, your actual security posture and traffic protection are unaffected. We are currently validating a performance optimization and will restore real-time scoring. We will continue to provide updates here as the investigation progresses. For detailed updates, please check the Servi...
UI Node will stop supporting Public API Traffic - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is announcing the official retirement of UI nodes for servicing Public API traffic. Currently, some Public API traffic lands on UI nodes instead of the designated Zscaler API (ZSAPI) nodes. To ensure optimal performance and alignment with our architectural standards, UI nodes will stop servicing Public API calls starting September 01, 2026. This follows the initial announcement of the ZSAPI framework transition made in April 2021 under the section Updates to Cloud Servi...
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 April 17, 2026 (Friday, April 17, 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...
Administration UI and User Authentication Issues - zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler has detected an issue with the administration UI and user authentication 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.Root Cause- The preliminary root cause of this issue is attributed to a fault in the control plane.Latest Update ...
New Delhi I (DEL1) Datacenter Network Maintenance - zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be performing hardware maintenance in the New Delhi I (DEL1) Datacenter.Maintenance window,Start: 2026-04-17 19:30:00 ISTEnd: 2026-04-17 23:30 IST(i.e. 2026-04-17 14:00 - 18:00 UTC)During the maintenance, traffic will failover to redundant devices in the same datacenter. However, intermittent connections and connection reestablishment may be observed.[NOTE: EXTENDING MAINTENANCE AN ADDITIONAL TWO HOURS]Update - Fri, 17 Apr 2026 18:12:50 UTCThis activity has been completed. Please...
