Zscaler is a leading cloud security platform, relied on by thousands of organizations to safeguard user access, secure cloud applications, and enforce security policies globally. When Zscaler experiences disruptions, it can impact everything from employee productivity to enterprise cybersecurity posture.
That’s why monitoring Zscaler’s cloud status is essential for IT and DevOps teams. StatusGator helps teams stay ahead of these disruptions by aggregating the Zscaler status and those of nearly 6,000 other SaaS providers into a single, unified view.
Whether you’re investigating a slowdown, confirming an ongoing incident, or reviewing Zscaler historical uptime, StatusGator keeps your team informed with real-time notifications and access to years of Zscaler outage history.
Below is a timeline of notable Zscaler cloud outages from 2025 back to 2021, as recorded by StatusGator.
April 30, 2025 – Widespread ZIdentity and Admin UI Disruption Across Zscaler Cloud
On April 30, 2025, Zscaler experienced a multi-region service degradation affecting its ZIdentity Portal and Admin UI across several cloud instances, including zscaler.net, zscalerone.net, zscalertwo.net, zscalerthree.net, and zscloud.net. The issue, marked by a status change from UP to WARN at 05:46 UTC, impacted users’ ability to access core identity and administration services.
Zscaler acknowledged the issue and began investigating immediately. Full service restoration was confirmed by 06:27 UTC.
Later the same day, at 08:26 UTC, a separate issue emerged within the zdxcloud.net instance, impacting Authentication Services. This was resolved by 11:51 UTC.
In the afternoon, a more serious regional degradation occurred in the Zscalerthree.net cloud affecting key U.S. locations: Boston, Chicago, New York, Washington D.C., and Atlanta. The incident, initially classified as WARN at 14:47 UTC, escalated to DOWN by 17:26 UTC. Users in these regions experienced slowness and degraded performance.
Zscaler teams worked to mitigate the disruption, and services were fully restored by 18:31 UTC. This event highlights the importance of real-time visibility into Zscaler cloud outages and ongoing monitoring of Zscaler’s operational status.
January 19, 2025 – Zscalerthree.net Cloud Traffic Forwarding and Authentication Disruption
On January 19, 2025, Zscaler experienced a multi-service disruption on the zscalerthree.net cloud, affecting several core components.
The incident began at 06:31 UTC, with initial degradations across the Traffic Forwarding and Authentication services. Over the next hour, issues extended to Admin UI, PAC, Source IP Anchoring (SIPA), and the Zscaler Client Connector.
By 09:46 UTC, all affected services transitioned from degraded performance (WARN) to a full outage (DOWN). Zscaler attributed the incident to complications arising during scheduled maintenance on the zscalerthree.net cloud.
The company acknowledged that the traffic forwarding issue was impacting all the affected services and began an investigation accordingly.
Services began recovering by 16:11 UTC, with all core functionalities returning to normal (UP) at that time.
The impacted services included:
- Core Cloud Services – Traffic Forwarding
- Core Cloud Services – Authentication
- Core Cloud Services – Admin UI
- Core Cloud Services – PAC
- Core Cloud Services – Zscaler Client Connector
- Core Cloud Services – Source IP Anchoring (SIPA)
Zscaler posted updates on their Trust Portal throughout the incident and provided guidance for affected customers.
October 22–23, 2024 – Zscaler Regional Outages Impact Microsoft Access and Connectivity
On October 22, 2024, Zscaler reported a widespread service degradation affecting data centers across Asia-Pacific (APAC) and Europe, Middle East, and Africa (EMEA), with a focus on access issues to Microsoft services and regional connectivity disruptions.
APAC – Intermittent Microsoft Access (Beijing III & Shanghai II)
Beginning at 08:01 UTC, multiple Zscaler clouds, including zscaler.net, zscloud.net, zscalerthree.net, and zscalertwo.net, experienced degraded performance at their Beijing III and Shanghai II data centers. Zscaler attributed the disruption to a transit issue, which led to intermittent access problems to Microsoft services across both facilities.
Zscaler worked with transit partners to address the issue, restoring all services to operational status by 09:52 UTC, resulting in a downtime duration of nearly two hours.
EMEA – Moscow III Datacenter Outage
Separately, the Moscow III data center experienced a complete outage across all Zscaler domains, including zscaler.net, zscloud.net, zscalertwo.net, and zscalerthree.net. Zscaler reported intermittent connection timeouts and began investigating the issue shortly afterward. Full recovery was achieved by 11:56 UTC, suggesting an outage duration of several hours.
Core Cloud Services – Content Delivery Degradation
Later that day, at 19:56 UTC, zdxcloud.net reported degraded performance in Core Cloud Services, Content Delivery, which lasted until October 23 at 20:11 UTC, affecting content distribution capabilities for over 24 hours.
Zscaler maintained ongoing communication through its Trust Portal and advised impacted users to monitor updates or contact support if additional assistance was needed.
This multi-region incident highlights the cascading impact that network transit issues and regional datacenter problems can have on Zscaler’s ability to deliver consistent access to third-party services like Microsoft.
October 6, 2024 – Major ZIdentity Outage Impacts Global Zscaler Services
On October 6, 2024, Zscaler experienced a widespread outage affecting its ZIdentity authentication services across all global cloud environments.
The disruption began at approximately 8:41 AM UTC, when multiple core services, including Authentication, Admin UI, and ZIdentity, across domains like zscaler.net, zscalerone.net, zscloud.net, zscalertwo.net, and others transitioned to a WARN state.
By 8:56 AM UTC, the incident escalated as services moved into a DOWN state. Zscaler confirmed an issue impacting ZIdentity, stating that customers could experience problems with logging in, accessing administrative interfaces, and general identity management functionality.
The following core services were affected: Authentication, Admin UI, and ZIdentity.
Zscaler engineers actively investigated the problem across all clouds during the incident. The services were fully restored and returned to UP status by 9:36 AM UTC, resolving the disruption within approximately 55 minutes.
This outage underscores the critical role ZIdentity plays in authentication and access across Zscaler’s cloud ecosystem, highlighting the need for real-time monitoring solutions.
February 20–22, 2023 – Widespread Zscaler Service Disruptions Across Global Data Centers
Between February 20 and 22, 2023, Zscaler experienced a widespread multi-region service degradation that impacted dozens of its global cloud infrastructure nodes.
The incident spanned North America, Asia, Europe, and Africa, involving a mixture of connectivity warnings, latency issues, and degraded performance across various services, including zscaler.net, zscalertwo.net, zscalerthree.net, and zscloud.net.
The disruptions began early on February 20, with an initial service warning in the Denver III data center (US & Canada region). Shortly after, warnings surfaced across multiple Asian regions such as Mumbai VI, Chennai II, and Core Cloud Services – PAC. On February 21, the incident continued with services in Miami III and Atlanta II also registering warnings.
By February 22, the issue had escalated, triggering a cascade of warnings across a large number of Zscaler nodes in India (Mumbai, Chennai, New Delhi), Singapore, and China (Beijing, Tianjin).
The warnings affected all three major Zscaler service domains. Recovery for most impacted nodes occurred gradually between 07:46 and 08:16 UTC on February 22.
Additionally, Zscaler’s public status messages indicated underlying problems in many data centers during the same timeframe:
- Africa: Connectivity issues were reported at the Capetown and Johannesburg III data centers.
- Asia-Pacific: The Shanghai, Chennai II, and Kuala Lumpur I data centers experienced instability, with some users advised to fail over to secondary sites.
- Europe: A major issue impacted the Frankfurt, Dusseldorf, Munich, Vienna, and Moscow data centers, with widespread reports of latency and slowness.
- Core Cloud Services: Zscaler identified a submarine cable fault affecting Singtel that degraded performance for traffic between the U.S. and Asia.
These overlapping incidents suggest Zscaler’s infrastructure was affected by both regional data center failures and underlying transit network problems, possibly related to external provider issues like the Singtel cable fault.
Although Zscaler restored service within a few hours in most locations, the broad geographic spread and cross-domain nature of the disruption made it a notably impactful outage.
June 1, 2022 – Major Zscaler Outage
On June 1, 2022, Zscaler experienced a widespread outage that impacted dozens of global data centers and core services.
The incident began at approximately 06:26 UTC and affected both zdxcloud.net and private.zscaler.com domains. Key services impacted included Core Cloud Services – Alerting and Admin UI, with significant disruptions to Zscaler Client Connector (ZCC) registration and portal access across all major regions, including North America, Europe, Asia, Latin America, the Middle East, and Africa.
More than 70 Zscaler nodes experienced disruptions, including key data centers in Beijing, Shanghai, Moscow, Atlanta, Boston, Chicago, Mumbai, London, Frankfurt, Sydney, and Sao Paulo.
Users reported issues accessing Microsoft Teams through the Beijing node, while Shanghai and Moscow faced broader datacenter-level outages.
The outage caused failures in device registration and access to the ZPA cloud via ZCC, impacting enterprise connectivity and zero trust access globally. Zscaler acknowledged multiple issues, such as:
- Failures accessing Microsoft Teams (Asia – Beijing)
- Widespread ZCC registration and portal failures
- Reporting issues in the Admin UI (Core Cloud Services)
- Data center connectivity problems across 6 continents
Zscaler provided ongoing updates and recommended failover to secondary data centers where available. The company’s support teams were engaged in mitigating the issue while communicating with impacted customers.
July 2021 – Regional Disruptions Across Multiple Zscaler Data Centers
In mid-July 2021, Zscaler experienced a series of service degradations and partial outages affecting users in Asia-Pacific and North America.
The first incident began on July 14 around 00:01 UTC, impacting multiple services in the Asia – Melbourne II region, including zscloud.net, zscaler.net, zscalerthree.net, and zscalertwo.net. These services entered a warning state, indicating degraded performance or limited functionality. Although stability returned around 00:27 UTC, another disruption occurred just four minutes later, lasting until 01:16 UTC.
On July 15 at 01:57 UTC, a similar degradation affected the Asia – Sydney III region. All core services, including private.zscaler.com, experienced warning-level disruptions. Service was gradually restored by 04:16 UTC.
That same day, a more severe issue hit the US & Canada – San Francisco IV at 19:32 UTC, where private.zscaler.com it briefly went down before moving to a warning state and finally recovering around 20:06 UTC.
Zscaler’s status messages at the time also referenced intermittent connection timeouts in the Asia – Beijing data center and a traffic rerouting event in Asia – Mumbai VI, suggesting broader regional instability. Zscaler acknowledged these issues publicly, noting ongoing investigations and routing adjustments to minimize customer impact.
These incidents highlight how Zscaler’s distributed cloud infrastructure can experience localized disruptions that ripple across dependent services and geographies, underscoring the importance of monitoring service health across all regions.
May 17–18, 2021 — Service Degradation Across Dubai I, Seoul I, and Zscaler Admin UI
On May 17, 2021, Zscaler experienced a multi-region service degradation that impacted customers in Asia and the Middle East, as well as users accessing core administrative services.
In Seoul, services such as zscalertwo.net, zscloud.net, zscaler.net, and zscalerthree.net transitioned from a degraded (WARN) status back to normal at around 02:26 UTC, indicating the resolution of a temporary issue.
Later that day, between 14:46 and 16:11 UTC, the Dubai I datacenter experienced issues that affected multiple Zscaler services.
Zscaler acknowledged a reporting and logging issue, assuring customers that policy enforcement remained intact and that user logs would be available once the issue was resolved.
Simultaneously, problems emerged in Core Cloud Services, including the Admin UI and Zscaler Client Connector Admin on the zscalerthree.net cloud. These began around 15:16 UTC and were not fully resolved until May 18 at 14:41 UTC, more than 23 hours later. Zscaler confirmed that users may have experienced intermittent timeouts while accessing the Admin UI or registering devices using the Zscaler Client Connector.
These service disruptions occurred alongside unrelated issues reported in other regions including Beijing, Cape Town, and Mumbai, indicating a broader operational strain across Zscaler’s global infrastructure during this period.
Conclusion
Zscaler plays a critical role in modern cloud security architectures, but like all complex cloud platforms, it’s not immune to outages. As shown by the detailed Zscaler outages history, even short disruptions can have widespread consequences.
By using StatusGator, your team can stay ahead of potential disruptions by monitoring the Zscaler status, receiving proactive alerts about incidents, and accessing comprehensive Zscaler historical uptime data. Whether you’re safeguarding business continuity or providing IT support, StatusGator helps you reduce downtime and gain instant visibility into your cloud providers’ reliability.
Even better, with StatusGator, you can track Zscaler incidents, aggregate the statuses of thousands of SaaS vendors, and publish your own public or private status pages, all in one place.
Our platform provides real-time alerts, historical outage data, early warning signals, and detailed uptime history, empowering you to detect issues faster, reduce downtime, and troubleshoot third-party dependency problems more efficiently.
Try StatusGator today and get instant alerts and visibility into Zscaler and every other service your business depends on.
