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, resulting in popular platforms such as X, Facebook, and chatbots like ChatGPT, Grok, and Perplexity becoming inaccessible to millions of users.
The issue did not stem from the platforms themselves but rather 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 monitoring site Down Detector was affected, complicating the situation further for those trying to understand what was happening. Users and website administrators were thrown into a frenzy while Cloudflare quickly acknowledged the issue, stating that it was 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 serious issues affected large parts of the internet due to malfunctions in Amazon Web Services (AWS), reminding us how dependent the internet has become on a few major infrastructure providers. Cloudflare is one of the key “invisible” players in the internet ecosystem. It operates as a reverse proxy server and a global Content Delivery Network (CDN). In simple terms, it sits between the user and the original server of a website, delivering copies of static content (images, CSS, JavaScript) from the nearest server. This reduces loading times while enhancing website resilience and availability.
Simultaneously, 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 crucial Cloudflare’s role is in ensuring smooth internet operations; a technical error in just one “node” of global digital infrastructure was enough to “flip the switch” for users worldwide – even if only temporarily.
The company stated that the problem has now largely been resolved; however, technical investigations continue to determine the exact causes and fully assess the damage.
