On Nov. 18, internet security provider Cloudflare had an outage due to a technical error, preventing websites that rely on their services from working.

Cloudflare provides various services such as DDoS attack protection, loading time speedups, CAPTCHAs and anti-bot filtering to websites, with its status as a high reliability and easily available provider cementing itself as a pivotal part of many websites’ operations. Similar to when Amazon Web Services had an outage, it proved to be a single point of failure for those websites that relied on Cloudflare’s services.

The issue, which was caused by a bug in their bot filtering systems, caused a majority of internet traffic that went through their servers to return a 500 Internal Server Error. This error took down websites like X (formerly known as Twitter), ChatGPT, Spotify and, ironically, Downdetector.

As usual, the internet came together to cast some humor on the situation, making and sharing memes about the outage.

The issue started at 5:28 a.m. CST, and was fully resolved by 11:06 a.m. CST.

Cloudflare has posted a blog outlining the cause of the issue and the timeline of events.

“Today was Cloudflare’s worst outage since 2019,” Matthew Prince, the CEO of Cloudflare and the author of the blog post, said. “We’ve had outages that have made our dashboard unavailable. Some that have caused newer features to not be available for a period of time. But in the last 6+ years we’ve not had another outage that has caused the majority of core traffic to stop flowing through our network. An outage like today is unacceptable.”