On November 18, 2025, a single configuration file change at Cloudflare disrupted access to large parts of the web. Around 11:20 UTC, Cloudflare’s network began returning a surge of HTTP 5xx errors. Users trying to reach services like X (formerly Twitter), ChatGPT/OpenAI, Ikea, Canva, and many others suddenly saw Cloudflare-branded error pages instead of the applications they expected. Cloudflare mitigated the issue, restored service, and published a detailed public report.