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Zendesk Outage: A Case for Proactive Monitoring and Faster Incident Response

See how Internet Performance Monitoring caught the Zendesk outage a full 21 minutes early and what it teaches teams about proactive monitoring and faster incident response.

4–5 minutes
Denton Chikura

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The quick download:

Independent, proactive monitoring is what separates teams that catch third-party outages early from teams that scramble to explain them.

  • Internet Sonar flagged the Zendesk outage 21 minutes before Zendesk’s own internal alerts fired.

  • Delayed root cause analysis cost businesses lost revenue, frustrated customers, and hours of manual workarounds as intermittent errors dragged on past 24 hours.

  • Multi-pod architectures add scalability but also hidden dependencies that can turn one failure into a cascading, cross-region disruption.

  • Give your team independent visibility into your internet stack so you can act on third-party incidents before they escalate.

On March 20, 2025, starting at 15:43 AM UTC, Zendesk users globally encountered 503 “Service Unavailable” errors and 5xx server-side issues, disrupting access to critical support tools and communication channels. While immediate mitigations stabilized core services, intermittent issues continued for over 24 hours, underscoring the complexity of multi-pod infrastructure failures.

Timeline of Events

  • 15:29 AM UTC: Zendesk’s internal team confirmed user reports of access issues.
  • 15:50 AM UTC: Root cause identified as widespread 503 errors impacting multiple service pods.
  • March 21, 2025, 10:59 PM UTC (06:29 AM EDT): Zendesk’s status page confirmed recovery of “majority of issues,” with ongoing efforts to resolve lingering intermittent failures.

Error message on accessing Zendesk services

The 503 Service Unavailable responses were not immediately recognized as the root cause of the disruption. This delay hindered Zendesk’s ability to fully understand the scope and impact of the outage in a timely manner and slowed the process of restoring service and assisting customers.

When Zendesk went down, businesses felt the impact

The Zendesk outage disrupted workflows for thousands of businesses relying on the platform for customer support, sales, and internal collaboration. With critical processes offline, teams struggled to deliver timely and effective customer service. Here are some of the key consequences.

#1 Access issues across multiple pods

Many users encountered 5xx errors, which indicated problems on the server side. Users across industries (from retail to healthcare) were abruptly locked out of Zendesk portals. Support teams couldn’t view tickets, update cases, or access customer history.

#2 Service degradation

Some services needed additional time to restart, leading to intermittent errors, often at the worst possible moments for businesses trying to handle customer inquiries. Support agents wrestled with inconsistent access and were forced to pause or redo tasks.

#3 Impact on communication channels

Zendesk’s core support tools went offline for large sections of the outage, limiting response times and workflow coordination. Web widgets used on company websites for direct customer engagement also went down, frustrating users who expected immediate assistance or quick self-service options.

#4 Prolonged resolution window

Even though Zendesk reported “majority of services” were restored by March 21, intermittent errors lingered for more than 24 hours. This likely forced businesses to switch to manual processes.

How Internet Performance Monitoring identified the outage before Zendesk did

Internet Sonar, an Internet Performance Monitoring tool, flagged the outage at 15:22 AM UTC, 21 minutes before Zendesk’s internal alerts.

Internet Sonar dashboard

The Internet Sonar dashboard shows Zendesk’s outage affecting multiple global locations, with 100% downtime reported across several cities.

Scatterplot showing multiple tests run against Zendesk domain failing

The scatterplot above from Internet Sonar visualizes the Zendesk outage, showing a surge in failed tests (red markers) starting around 15:22 AM UTC. The concentration of failures indicates a widespread service disruption.

503 Service Unavailable errors affecting Zendesk

The cost of delayed root cause analysis

Zendesk’s internal team took 21 minutes to correlate user reports with the 503 errors that Internet Sonar had already flagged. While this might not seem like a long time, every minute of downtime means lost revenue, frustrated customers, and operational disruptions. The longer it takes to pinpoint the issue, the longer it takes to fix it.

Without immediate visibility into where and why a problem is occurring, IT teams waste precious time in war rooms trying to determine if the issue is internal or caused by a third-party provider.

Independent proactive monitoring of your Internet Stack is essential

No organization can afford to operate without independent, proactive visibility into their digital ecosystem. That’s where Internet Performance Monitoring comes in.

Internet Sonar dashboard

Internet Sonar eliminates guesswork by providing real-time, independent Internet health data. With Internet Sonar, you’ll know whenever a third party has an outage, where it’s happening, how long it’s been going on, and whether it’s likely to affect you.

The hidden challenges of multi-pod infrastructure

The Zendesk outage also exposed vulnerabilities of multi-pod architectures, where failures in one pod cascaded into issues across multiple regions. While these architectures are designed for scalability and redundancy, they introduce complexities that can extend downtime when something goes wrong.

In this case, even after initial recovery, intermittent failures continued for over 24 hours, preventing full service restoration. For companies reliant on cloud-based applications like Zendesk, this reinforces the need for deep visibility into third-party infrastructure dependencies to understand:

  • Where failures are occurring
  • How they impact interconnected systems
  • How long the recovery process might take

Internet Stack Map can help with this by showing a live view of the health of your digital service and the services it depends on.

Internet Stack Map dashboard

By automatically discovering third-party dependencies, Internet Stack Map helps organizations understand the health of their digital ecosystem at a glance. When one component fails, it’s clearly highlighted, making root-cause analysis seamless.

Full visibility starts here

Outages like Zendesk’s reinforce a fundamental reality: you can’t protect what you can’t see. LogicMonitor brings together internet visibility, infrastructure monitoring, and AI orchestration into one platform, giving teams unified visibility from user to code. That means faster detection, clearer context, and confident action, whether the issue sits inside your environment or with a third-party provider.

Catch third-party outages before they impact your users.

LogicMonitor Synthetics and Internet Performance Monitoring deliver independent, real-time visibility into every dependency in your internet stack, so you can detect, diagnose, and resolve incidents faster. See how it works in your environment.

FAQs

How did Internet Sonar detect the Zendesk outage before Zendesk’s own team?

Internet Sonar continuously runs independent tests against services from global locations, so it flagged widespread 503 failures at 15:22 AM UTC. That was 21 minutes before Zendesk’s internal alerts confirmed the issue, giving affected teams an earlier warning of a third-party problem.

Why did the Zendesk outage take so long to fully resolve?

Zendesk runs on a multi-pod architecture, where a failure in one pod can cascade across regions. Even after core services stabilized, intermittent errors persisted for more than 24 hours, which delayed full restoration and pushed some businesses to manual processes.

How can businesses reduce the impact of third-party outages like this one?

Independent, proactive monitoring gives teams visibility into services they depend on but do not control. Tools like Internet Sonar and Internet Stack Map show where a failure is happening, how it affects connected systems, and how long it has been ongoing, which speeds up root cause analysis and incident response.

By Denton Chikura

Technical Writer

Denton Chikura is a technical writer and longtime observability advocate focused on helping site reliability engineers and engineering teams discover the tools and capabilities that strengthen internet resilience. He works at the intersection of monitoring, performance, and infrastructure to make complex systems more understandable and usable, bridging the gap between deep technical detail and real‑world operations. His goal is to help teams build faster, detect issues earlier, and recover smarter, ultimately making the internet a better, more reliable place for everyone.

Disclaimer: The views expressed on this blog are those of the author and do not necessarily reflect the views of LogicMonitor or its affiliates.

© LogicMonitor 2026 | All rights reserved. | All trademarks, trade names, service marks, and logos referenced herein belong to their respective companies.

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