According to
information from multiple media and Cloudflare status pages, on the evening of November 18, 2025, Beijing time, cloud service and network security provider Cloudflare suffered a severe internal service downgrade, with a large number of 500 errors and "Cloudflare network internal server errors" worldwide. Affected websites include social platforms X (formerly Twitter), ChatGPT/OpenAI, Spotify, Canva, and some gaming and news websites, which were once inaccessible or loaded abnormally. The outage started at around 6 a.m. EST, and then there were reports of blocked access, which was a typical Cloudflare-side infrastructure-level incident.
In its status update, Cloudflare mentioned that it had detected an "unusual traffic spike" that caused problems with some traffic forwarded through its network, and said that a fix has been released and that global access is gradually recovering, but there may still be a high error rate in the short term. In this incident, many users saw the "Please unblock / Please unblock challenges.cloudflare.com to proceed" prompt when visiting websites like ChatGPT. Technical media and community analysis suggested that this phenomenon was related to an exception or connection failure to the challenges.cloudflare.com subdomain that Cloudflare uses for human authentication, rather than the user actually blocking the domain. Overall, the description "Today's Cloudflare global incident, even GPT and your website are disconnected" is generally true in terms of direction, but a more accurate statement would be that Cloudflare's failure caused a large number of websites that rely on its services to fail, and local network and browser configurations usually require no additional adjustments. As for the specific cause of the accident, a detailed technical report has not yet been released, and there is still uncertainty.
FAQsQ
: When did this Cloudflare global outage occur?
A: Public monitoring records show that the outage began at around 6 a.m. ET on November 18 and quickly expanded the scope of the impact. Most services resumed within a few hours, but officials suggest that there may still be sporadic errors for a period of time.
Q: Are ChatGPT, X and other services "down" by themselves?
A: Current information shows that the main problem is at Cloudflare's CDN and security proxy level, where a large number of requests are blocked by 500 errors before they reach these websites, so it appears that ChatGPT, X, Spotify, etc. are inaccessible, and not all of these apps crash at the same time.
Q: Why does the prompt "Please unblock challenges.cloudflare.com and continue" appear?
A:challenges.cloudflare.com is a subdomain that Cloudflare uses for human authentication and security challenges, and it usually loads CAPTCHAs or verification scripts. During this outage, the domain name was accessed abnormally, and the front-end page mistakenly thought it was blocked by a user or plugin, resulting in an "Please unblock" prompt, rooted in a Cloudflare side service exception.
Q: Do I need to actually "unblock" the domain name in my browser?
A: If you haven't intentionally blocked challenges.cloudflare.com in your browser extension, Hosts file, or router before, you generally don't need to do anything extra and just refresh the page after Cloudflare mitigates it. Users using aggressive ad blocking or privacy extensions can check if the domain was blocked by mistake, but this large-scale anomaly is primarily related to Cloudflare's failure.
Q: Is this Cloudflare outage completely over, and will there be another similar incident?
A: At present, most service visits have returned to close to normal levels, but the official has not released a full technical analysis report. Whether similar large-scale failures will occur again in the future depends on Cloudflare's subsequent troubleshooting results and reinforcement measures, and there is still some uncertainty.
