Understanding Today's Cloudflare Outage

Early this morning, a significant portion of the internet seemed to grind to a halt. Users around the world encountered “Internal Server Error” messages on popular websites and services, from social media platforms like X (formerly Twitter) to critical business tools like OpenAI’s ChatGPT. The culprit was a major service disruption at Cloudflare, a foundational pillar of the modern internet.

For many businesses, this event was a stark reminder of how interconnected and fragile our digital world can be. At Capital Cyber, we believe in empowering our clients with knowledge. This post will break down what happened, how it relates to DNS protection, and what your business can do to prepare for the next inevitable outage.

What Happened?

On the morning of November 18, 2025, Cloudflare began experiencing what they described as a “spike in unusual traffic” to one of their services ^[1]. This triggered a cascade of failures across their network, leading to widespread “500 Internal Server Error” messages for websites and applications that rely on their infrastructure. The outage affected a vast array of services, demonstrating Cloudflare’s enormous footprint in the internet ecosystem.

The company, often described as “the biggest company you’ve never heard of,” acts as a gatekeeper for a significant portion of web traffic. It provides essential services like Distributed Denial of Service (DDoS) protection, a Content Delivery Network (CDN), and, most critically in this case, Domain Name System (DNS) services.

The Role of DNS Protection

Think of DNS as the phonebook of the internet. When you type a website address like “capital-cyber.com” into your browser, DNS servers translate that human-readable domain name into a machine-readable IP address. Cloudflare’s DNS service is one of the fastest and most widely used in the world.

Today’s outage directly impacted this crucial translation service. When Cloudflare’s DNS faltered, browsers couldn’t find the correct IP addresses for websites, effectively making them unreachable. This is why even though the websites themselves were likely still online, users couldn’t access them. For businesses that rely on Cloudflare for DNS protection, this meant their websites, and potentially their email and other services, were offline for many customers.

What to Do During an Outage

When an outage of this magnitude occurs, panic is a common reaction. However, a measured and informed response is far more effective.

Step	Action	Description
1	Verify the Source	Check official status pages from Cloudflare and Downdetector to confirm the issue is external and not specific to your own systems.
2	Communicate Proactively	Inform your customers about the issue through alternative channels like social media (if available) or a pre-prepared status page. Transparency builds trust.
3	Contact Your Support Team	Reach out to your IT partner. They can help diagnose the extent of the impact on your specific services and advise on potential workarounds.

Best Practices for Future Resilience

While it’s impossible to prevent outages at major infrastructure providers, you can take steps to mitigate their impact on your business.

Redundancy is Key: For mission-critical applications, consider a multi-DNS or multi-CDN strategy. This involves using more than one provider so that if one fails, traffic can be automatically rerouted through another.
Develop an Incident Response Plan: Don’t wait for a crisis to make a plan. Know who to contact, how you will communicate with customers, and what your immediate technical steps will be.
Regularly Review Your Configuration: Work with your IT provider to regularly review your DNS and CDN configurations to ensure they are optimized for resilience and performance.

Is my industry affected?

References

[1] The Guardian. “Cloudflare outage causes error messages across the internet.” https://www.theguardian.com/technology/2025/nov/18/cloudflare-outage-causes-error-messages-across-the-internet