On Tuesday, November 18, 2025, a global blackout affecting Cloudflare, a major player in Internet infrastructure, has caused a digital shockwave: many French and international sites — such as ChatGPT, X (ex-Twitter), Doctissimo, marmiton — have become inaccessible, sparking a wave of concern about the resilience of the Internet.
What happened: a massive outage
According to reports, the incident began around 11:20 UTC when Cloudflare detected an “unusual spike in traffic” to one of its services. This surge in traffic triggered a cascade of errors: “500 Internal Server Error” messages multiplied across thousands of sites dependent on the Cloudflare network.
The affected platforms are among the most widely used: ChatGPT, X, Spotify, Canva, Doctissimo, Marmiton… The CDN (Content Delivery Network) giant claims to manage nearly 20% of global web traffic — which explains the massive scope of the outage.
Cloudflare responds: cause, resolution, and measures taken
In response to the incident, Cloudflare communicated quickly: a fix was deployed shortly after, and the company indicates that the “situation is now resolved”, while continuing to monitor its network to prevent possible regressions.
According to Cloudflare's CTO, this outage was not related to an external attack, but to a latent bug : a configuration change caused a malfunction in their “Bot Management” system, resulting in a wider degradation of the infrastructure.
The consequences for French internet users
- Many users in France have noticed loading errors on sites like Doctissimo ou marmiton, or slowdowns or even blockages.
- Some, according to media reports, had to go through mobile applications to work around the outage, particularly for services like ChatGPT, because access via web browser was unstable.
- This breakdown illustrates the critical dependence of many websites on centralized infrastructure providers.
- For some users of ChatGPT FreeThe situation was particularly frustrating: the tool, usually accessible online, became inoperative via browser, prompting users to use the...application mobile to bypass the outage.
Analysis: Why this outage raises strategic questions
- Systemic risk : when an actor like Cloudflare falters, it's an entire section of the web that falters — demonstrating the point of vulnerability that major infrastructure providers represent.
- Internet Resilience The incident highlights the need for redundancy, alternative systems, and contingency plans for critical sites.
- Transparency and Accountability Cloudflare has acknowledged the error, but the "latent bug" mentioned raises questions about internal audits and the robustness of software updates.
- User trust For French companies or startups, this type of failure can undermine confidence in the public internet's cloud infrastructure.
The gradual return to normal
According to Cloudflare's communications, access to services such as WARP and the customer portals have been gradually restored. However, some users have still reported some issues. residual errors or slowness on their dashboard.
In conclusion
The Cloudflare outage of November 18, 2025, serves as a stark reminder that The web infrastructure is not infallibleeven when it relies on technological leaders. For French internet users as well as for businesses, this is a strong signal: strengthening digital resilience, diversifying suppliers and anticipating risks are no longer options, but a necessity.