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
London V Datacenter Scheduled Maintenance - IPv6 Enablement - zscalertwo.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be enabling IPv6 at our London V (LON5) Data Center. During the maintenance window the services through LON5 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 April 10, 2:00 pm PDT (April 10, 21:00 UTC)End time is April 10, 6:00 pm PDT (April 11, 1:00 UTC)Update 4/8: Maintenance Window Updated
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 enabl...
Munich I Datacenter Scheduled Maintenance – IPv6 Enablement - zscloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler will perform scheduled maintenance at our Munich I (MUC1) Data Center to complete preparatory work for future IPv6 enablement. During the maintenance window, services through the MUC1 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 April 7, 1:00 pm PDT (April 7, 20:00 UTC)End time is April 7, 6:00 pm PDT (April 8, 1:00 UTC)Update - Tue, 07 Apr 2026 23:41:56 UTCThis activ...
China Premium Access Plus Beijing V and Shanghai VI Datacenter Network Maintenance - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Beijing V and Shanghai VI DC network providers have advised maintenance work as below. During the maintenance window, China Premium Access Plus services within these data centres may experience intermittent disconnections.Start Time: 2026-04-12 12:00:00 UTCEnd Time: 2026-04-12 14:00:00 UTC(Datacenter Local Time 2026-04-12 20:00 - 2026-04-12 22:00 China Standard Time (UTC+8:00))Reason of Maintenance: Provider advised maintenance.Impact During Maintenance: Intermittent connectivity might ...
Atlanta III (ATL3) Datacenter Network Maintenance - zscaler.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler will be performing hardware maintenance in the Atlanta III (ATL3) Datacenter.Maintenance window,Start: 2026-4-7 18:00 ESTEnd: 2026-4-7 20:00 EST(i.e. 2026-4-7 22:00 - 2026-4-8 00:00 UTC)During the maintenance, traffic will failover to redundant devices in the same datacenter. However, intermittent connections and connection reestablishment may be observed.
Urgent Maintenance on zdxcloud.net - zdxcloud.net
majorSource not attested
Last archived state: investigating
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investigating
The Zscaler SRE team will be performing an urgent maintenance on the zdxcloud.net cloud. This maintenance is scheduled for Sunday at 06:15 AM UTC on April 05, 2026, and can take up to 1 hour 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 collected and available after maintenance has completed.Update - Sun, 05 Apr ...
ZDX Admin Portal – Reporting and Logging Delay - zdxcloud.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler has detected an issue with the ZDX cloud. Customers may experience a temporary delay in reporting data.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 - Mon, 06 Apr 2026 03:31:53 UTCNo issues have been observed during the monitoring period. We have applied...
ZDX Admin Portal – Reporting and Logging Delay - zdxcloud.net
majorSource not attested
Last archived state: investigating
View archived record details
investigating
Zscaler has detected an issue impacting connectivity between client connector and ZDX cloud. Customers may experience a temporary delay in reporting data.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: A service component within the ZDX cloud was unable to process u...
Private Service Edge (PSE) – Intermittent Traffic Blocking for Explicit Proxy Traffic - zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net
majorSource not attested
Last archived state: investigating
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investigating
Zscaler is aware of and actively investigating an issue impacting a subset of customers using Private Service Edge (PSE). Some customers are experiencing intermittent traffic blocking when accessing websites through PSE. Affected requests may return the error: "Web Application Blocked by Firewall Rule."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 cha...
The Zscaler Site Reliability Engineering team will be performing an urgent maintenance during which access to the Zscaler Management Portal for Partners and ZDX Admin Portal might not be available. This maintenance is scheduled for Saturday at 05:45 AM Pacific Time on April 04, 2026 (Saturday, April 04, 2026 12:45 PM UTC), and can take up to 2 hours to complete. All logs will be collected and available after maintenance is complete. Please contact Zscaler Support if you have additional questi...
