19 November 2025

The disruptions were traced back to problems involving Cloudflare, a major internet infrastructure provider responsible for securing and optimising a large portion of the web. Reports of issues began emerging shortly after 11:30 GMT, with users reporting difficulty accessing sites like Grindr, Zoom, Canva, and others through outage monitoring platform Downdetector.

Cloudflare acknowledged that a "significant outage" had taken place after a configuration file intended to manage threat traffic malfunctioned, leading to a crash in its software that affected its broader services. The company issued an apology, stating, "We apologise to our customers and the Internet in general for letting you down today." It further emphasised that, while the problem had been resolved, some services might still experience errors as they gradually came back online.

The outage impacted a wide array of applications and websites, with some users seeing error messages such as "please unblock challenges cloudflare.com to proceed" on ChatGPT and internal server error notices on X's homepage. Downdetector itself also reported errors as many users tried to access the site during the outage.

Cloudflare, which provides internet security services including bot detection and mitigation of denial-of-service attacks, claims that the incident was purely a technical failure and not the result of malicious activity or attacks. The company highlighted its critical role in protecting over 20% of all websites globally, underscoring how many sites rely heavily on its infrastructure for security and performance.

Cloudflare’s stock price was reported to be approximately 3% lower shortly after 15:00 GMT, reflecting investor concern over the incident. Cybersecurity experts warn that such outages highlight the vulnerabilities inherent in the internet’s interconnected systems, emphasising the need for diversification and resilience in online infrastructure.