CLOUDFLARE: What Caused the Temporary Website “Blackout” – Dozens of Giants, from X to ChatGPT, Went Down
A temporary “blackout” occurred on the internet on Tuesday, November 18, affecting popular platforms such as X, Facebook, and chatbots like ChatGPT, Grok, and Perplexity, rendering them inaccessible to millions of users.
The issue did not originate from the platforms themselves but stemmed from a technical problem in Cloudflare’s content delivery network (CDN), one of the largest companies powering a significant portion of the global web. For a time, even the outage tracking site Down Detector was affected, complicating the situation further for those trying to understand what was happening. Users and website administrators were in a frenzy while Cloudflare quickly acknowledged the issue, stating they were investigating the problem. Users attempting to access various websites encountered messages indicating an “internal server error on Cloudflare’s network.” Gradually, services began to restore, although the company warned that increased error rates might persist until full recovery.
This incident comes about a month after significant issues arose across much of the internet due to malfunctions in Amazon Web Services (AWS), highlighting how dependent the internet has become on a few major infrastructure providers. Cloudflare is one of the key “invisible” players in this ecosystem. It operates as a reverse proxy and a global Content Delivery Network (CDN). In simple terms, it sits between the user and a website’s origin server, delivering copies of static content (images, CSS, JavaScript) from the nearest server. This reduces loading times while enhancing website resilience and availability.
Additionally, its most critical function is security; Cloudflare filters out malicious traffic and protects its clients from denial-of-service attacks (DDoS) and other online threats before they reach the servers of websites.
According to company data, approximately 20% of the global web “passes” through its network, with not only websites but also mobile applications, APIs, artificial intelligence workflows, and corporate networks relying on its services. Among its millions of clients are hundreds of thousands of subscribers, including 35% of Fortune 500 companies.
The recent incident highlighted how critical Cloudflare’s role is for the smooth operation of the internet; a technical error in just one “node” of global digital infrastructure was enough to “flip the switch” for users worldwide – even if temporarily.
The problem has largely been resolved according to the company; however, technical investigations into the exact causes and a full assessment of the damage continue.
