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
Chicago I (CHI1) Datacenter Network Maintenance - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com, zdxcloud.net, zpatwo.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will be performing hardware maintenance in the Chicago I (CHI1) Datacenter.Maintenance window,Start: 2026-4-13 03:00 CDTEnd: 2026-4-13 05:00 CDT(i.e. 2026-4-13 08:00 - 10:00 UTC)No service impact is expected during this maintenance.
Maintenance Window Updates - zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is updating the maintenance window schedule for Oceania, APAC and AMER regions. The new schedule is effective starting April 23, 2026. Service updates for all regions will be recurring.Time (in UTC- Coordinated Universal Time)REGIONMONTUESWEDTHUFRISATSUNOceania 9:00 AM – 11:00 AM9:00 AM – 11:00 AM9:00 AM – 12:00 PM 9:00 AM – 12:00 PM Asia Pacific8:00 PM – 10:00 PM8:00 PM – 10:00 PM8:00 PM – 10:00 PM4:00 PM – 7:00 PM 1:00 PM - 4:00 PM3:00 PM – 6:00...
Maintenance Window Updates - zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is updating the maintenance window schedule for Oceania, APAC and AMER regions. The new schedule is effective starting April 23, 2026. Service updates for all regions will be recurring. Time(in UTC- Coordinated Universal Time)REGIONMONTUESWEDTHUFRISATSUNOceania 9:00 AM – 11:00 AM9:00 AM – 11:00 AM9:00 AM – 12:00 PM 9:00 AM – 12:00 PM Asia Pacific8:00 PM – 10:00 PM8:00 PM – 10:00 PM8:00 PM – 10:00 PM4:00 PM – 7:00 PM 1:00 PM - 4:00 PM3:00 PM –...
Maintenance Window Updates - zscalertwo.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is updating the maintenance window schedule for Oceania, EMEA and AMER regions. The new schedule is effective starting April 23, 2026. Service updates for all regions will be recurring.Time (in UTC- Coordinated Universal Time)REGIONMONTUESWEDTHUFRISATSUNOceania 9:00 AM – 11:00 AM9:00 AM – 11:00 AM 9:00 AM – 12:00 PM9:00 AM – 12:00 PM Asia Pacific8:00 PM – 10:00 PM8:00 PM – 10:00 PM8:00 PM – 10:00 PM 4:00 PM – 7:00 PM1:00 PM -4:00 PM EMEA8:00 PM...
Maintenance Window Updates - zscaler.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is updating the maintenance window schedule for Oceania, APAC, EMEA and AMER regions. The new schedule is effective starting April 23, 2026. Service updates for all regions will be recurring.Time (in UTC- Coordinated Universal Time)REGIONMONTUESWEDTHUFRISATSUNOceania 9:00 AM – 11:00 AM9:00 AM – 11:00 AM 9:00 AM – 12:00 PM9:00 AM– 12:00 PM9:00 AM– 12:00 PMAsia Pacific8:00 PM – 10:00 PM8:00 PM – 10:00 PM8:00 PM – 10:00 PM 4:00 PM – 7:00 PM1:00 PM– 4:00...
Maintenance Window Updates - zscalerone.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is updating the maintenance window schedule for Oceania, EMEA and AMER regions. The new schedule is effective starting April 23, 2026. Service updates for all regions will be recurring.Time(in UTC- Coordinated Universal Time)REGIONMONTUESWEDTHUFRISATSUNOceania 9:00 AM – 11:00 AM9:00 AM – 11:00 AM 9:00 AM – 12:00 PM9:00 AM – 12:00 PM EMEA 1:00 AM– 4:00 AMAMER 6:00 AM – 8:00 AM6:00 AM – 8:00 AM6:00 AM – 8:00 AM ...
Delay in Processing Inbound Emails to Support Cases - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, private.zscaler.com, zdxcloud.net, zpatwo.net, app.zsdpc.net, app.eu.zsdpc.net, zpabeta.net, zsdkone.net, zscalerrisk.net, admin.zscaleranalytics.net, zslogin.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler is aware of an issue impacting delay in processing inbound emails to support cases.Zscaler services are operating normally; delays are currently impacting the synchronization of inbound email communications related to support cases. This is due to a dependency issue with our service provider that is affecting email processing, leading to slower updates. Zscaler is actively coordinating with the service provider to restore normal functionality.Impact: During this time, customers m...
Scheduled Maintenance - zscaler.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
The Zscaler Site Reliability Engineering team will be performing a scheduled maintenance on zscaler.net cloud. This maintenance is scheduled for Saturday at 06:00 AM Pacific Time on April 11, 2026 (Saturday, April 11, 2026 01:00 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 up...
Zscaler is currently investigating reports of issues with its zscaler.net, zscloud.net Cloud. Customers using IdP-initiated authentication may experience login failures.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 issue occurred due to a recently enabled feat...
