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.
August 2026
Administration UI and User Authentication Issues - zscalerthree.net
Source 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. Customers may encounter issues with Administation UI login, Authentication, User Policies, Zscaler Client Connector portal, and SCIM auto-provisioning. 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 pos...
Datacenter Expansion Hongkong III (HKG3) - private.zscaler.com
Source not attested
Last archived state: investigating
View archived record details
investigating
As part of our regular expansion of capacity, we are adding ZPA Public Service Edge nodes to our new data center in HongKong III (HKG3).If you restrict outbound firewall access, please ensure you have added the complete set of published IPs in the URL belowhttps://config.zscaler.com/private.zscaler.com/zpa
San Francisco IV (SJC4) Datacenter Network Maintenance - zscalertwo.net
minorSource not attested
Last archived state: resolved
View archived record details
resolved
Zscaler will be performing hardware maintenance in the San Francisco IV (SJC4) Datacenter.Maintenance window,Start: 2026-08-05 20:00 PDTEnd: 2026-08-05 23:00 PDT(i.e. 2026-08-06 03:00 - 06:00 UTC)During the maintenance, traffic will failover to redundant devices in the same datacenter. However, intermittent connections and connection reestablishment may be observed.Update - Thu, 06 Aug 2026 03:30:13 UTCThis activity has been completed. Please contact Zscaler Support if you have additional que...
Zscaler has detected an Authentication issue with Zscaler Client Connector (ZCC) and Admin UI 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 Zs...
Diagnostic Logs Issue - zpatwo.net
Source not attested
Last archived state: investigating
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investigating
Zscaler identified an issue affecting reporting and logging on the zpatwo.net cloud. As a result, customers may experience a disruption in diagnostic log collection.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 logging cluster issue in the ZPA2 environment cause...
Frankfurt IV (FRA4) Datacenter Network Maintenance - zscloud.net
minorSource not attested
Last archived state: resolved
View archived record details
resolved
Zscaler will be performing hardware maintenance in the Frankfurt IV (FRA4) Datacenter.Maintenance window,Start: 2025-08-05 02:00 CESTEnd: 2025-08-05 04:00 CEST(i.e. 2025-08-05 00:00 - 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.Update - Wed, 05 Aug 2026 00:04:43 UTCThis activity has been completed. Please contact Zscaler Support if you have additional quest...
Zscaler has detected an issue with the administration UI on its zscaler.net Cloud. Customers may encounter issues with Admin UI login, Zscaler Client Connector portal, and SCIM auto-provisioning.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: Issue occurred due to a...
Zscaler is aware of service impact stemming from an incident affecting our third-party vendor, Snowflake. Customers may experience disruptions with analytics and reporting capabilities that depend on Snowflake.Snowflake is actively engaged in remediation efforts. For the most current updates, please refer to Snowflake’s status page
Scheduled Maintenance Extended - zscloud.net
minorSource not attested
Last archived state: resolved
View archived record details
resolved
The Zscaler Site Reliability Engineering team will be extending the scheduled maintenance of the zscloud.net cloud by 2 hours. As part of our standard maintenance process, all logs will be collected and available after maintenance has been completed. Please contact Zscaler Support if you have additional questions.
Additions to Zscaler Hub IP Address Ranges - zscaler.net, zscalerone.net, zscalertwo.net, zscloud.net, zscalerthree.net, zdxcloud.net
Source not attested
Last archived state: investigating
View archived record details
investigating
Dear Zscaler Customer,In accordance with Zscaler Service Continuity Policy and per email notification sent on July 31, 2026, we would like to notify you of the changes to the Zscaler Hub IP Addresses as listed below. These will be effective anytime on or after September 29, 2026; 60 days or more from the date the first email notification is sent.Please update your firewall policy rules and any upstream Access Control Lists (ACLs) to allow the new IP address ranges to avoid any service disru...
