ChatGPT and the social-media platform X were among the websites blocking some users’ access on Tuesday as the web security firm Cloudflare Inc. worked to address a widespread, worldwide networking outage.

Cloudflare was investigating an issue that “potentially impacts multiple customers,” the San Francisco-based company said on its website. The same page shows Cloudflare had been experiencing issues with a customer support portal, and had been scheduled to conduct some scheduled maintenance in some areas earlier in the day. At one point, Cloudflare’s own outage status website wasn’t loading.

Cloudflare’s software is used by hundreds of thousands of companies globally, acting as a sort of buffer between their websites and end users and working to protect their sites from attacks that migh

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