A temporary internet outage occurred on Tuesday, November 18, affecting popular platforms like X, Facebook, and chatbots such as ChatGPT, Grok, and Perplexity, leaving millions of users unable to access them. The issue was not with the platforms themselves but due to a technical problem in Cloudflare’s content delivery network (CDN), one of the largest companies operating a significant portion of the global web. Even Down Detector, a site for tracking outages, was affected, complicating the understanding of the situation. Users and website administrators were in a frenzy while Cloudflare quickly acknowledged the issue and announced an investigation. Users attempting to access various websites encountered ‘internal server error’ messages on Cloudflare’s network. Gradually, services began to recover, although the company warned that error rates might remain high until full restoration.
This incident follows about a month after major internet issues caused by Amazon Web Services (AWS) malfunctions, highlighting how dependent the internet has become on a few large infrastructure providers. Cloudflare is a key ‘invisible’ player on the internet, functioning as a reverse proxy and global CDN. It sits between users and original website servers, delivering static content copies (images, CSS, JavaScript) from the nearest server to reduce load times and improve site resilience and availability.
Additionally, Cloudflare’s most critical function is security; it filters malicious traffic and protects its clients from denial-of-service (DDoS) attacks and other online threats before they reach website servers.
According to company data, approximately 20% of the global web traffic passes through its network. Its services support not only websites but also mobile apps, APIs, AI workflows, and corporate networks. Among its millions of clients are hundreds of thousands of subscribers, including 35% of Fortune 500 companies.
Today’s incident highlighted how crucial Cloudflare’s role is in the smooth operation of the internet; a technical fault at just one ‘node’ of the global digital infrastructure was enough to ‘flip the switch’ for users worldwide—even temporarily.
The problem has largely been resolved according to the company, though technical investigations continue into the exact causes and full assessment of the damage.
