Website QA intelligence for teams who ship
⚲
Guides Tool Comparisons QA Glossary Archive RSS Feed
heads-up platform & cms 10 sources 2 min read

Cloudflare Seattle Outage Causes Argo Smart Routing Errors

What happened

Cloudflare experienced a nearly two-hour service disruption on April 17, affecting customers connecting through their Seattle data center or using Argo Smart Routing that was routing traffic through Seattle. The incident began at 18:01 UTC and was resolved at 19:50 UTC, with customers experiencing increased error rates during this period. Argo Smart Routing is Cloudflare's premium traffic optimization service that automatically routes requests through the fastest available paths. The outage specifically impacted users whose traffic was being intelligently routed through the Seattle point of presence.

Business impact

Enterprise websites relying on Cloudflare's Seattle infrastructure or Argo Smart Routing experienced elevated error rates for nearly two hours, potentially causing customer-facing disruptions and lost revenue. Companies with significant Pacific Northwest user bases or those using Argo's intelligent routing were particularly vulnerable to this single point of failure.

Background

Cloudflare operates one of the world's largest CDN networks, with many enterprise websites depending on their infrastructure for performance and availability. Argo Smart Routing is positioned as a premium service that dynamically selects optimal network paths, but this incident demonstrates how intelligent routing can concentrate risk when routing decisions funnel traffic through affected nodes. Single data center issues at major CDN providers have previously caused widespread enterprise website disruptions.

What this means for your team

Review your CDN failover configurations to ensure traffic can automatically route around individual data center failures. Test your monitoring systems to verify they detect CDN-related error rate increases and alert appropriate teams within minutes. If using Cloudflare Argo or similar intelligent routing services, understand how traffic gets distributed and ensure you have visibility into which data centers are handling your traffic. Document incident response procedures that include CDN provider status pages as primary information sources during unexplained error rate spikes.

What to watch

Monitor Cloudflare's transparency reports about this incident to understand the root cause and any infrastructure changes they implement. Check if similar regional outages occur at other major CDN providers, which could indicate broader infrastructure vulnerabilities.

Sources

Related stories