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A major Cloudflare outage recently caused hundreds of websites around the world to go offline. The internet experienced a sudden crash after what Cloudflare described as a huge spike in unusual traffic. The outage lasted nearly six hours and was traced back to a hidden bug inside one of Cloudflare’s core services.
Cloudflare, a San Francisco–based company, provides security, performance, and infrastructure for a large portion of the internet. One of their key responsibilities is protecting websites from DDoS attacks, where attackers flood a site with massive traffic to slow it down or knock it offline.
Because Cloudflare supports so many websites, the issue spread quickly. Popular platforms such as ChatGPT, Twitter, Perplexity, Claude, Grindr, Uber, Canva, Spotify, NJ Transit, League of Legends, and even the outage-tracking site DownDetector were affected.
What Cloudflare Said About the Incident
Cloudflare’s CTO, Dane Knecht, explained that the problem began when a routine configuration change triggered a crash in their bot-mitigation service. That failure then spread across Cloudflare’s network, causing a large-scale slowdown and outages.
He clarified that it was not a cyberattack, but rather a bug that went unnoticed during testing.
Some users also saw an error message such as:
“Please unblock challenges.cloudflare.com to proceed.”
What Experts Say About It
Mike Chapple, an IT professor at the University of Notre Dame, explained that Cloudflare works silently behind the scenes to make websites faster and safer. But when Cloudflare itself encounters a problem, the impact is massive because so much internet traffic flows through their network.
He compared Cloudflare to a giant global content delivery network (CDN) that distributes content from millions of websites across thousands of servers worldwide.
Chapple added that when you visit a website using Cloudflare, your device does not connect directly to that website. Instead, it connects to the nearest Cloudflare server, which speeds up your browsing and protects sites from high traffic. But when Cloudflare goes down, many websites go down with it—around 20% of the entire internet.
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