Cloudflare, the content delivery and cybersecurity provider used by approximately 20% of all websites , says it has resolved the issue that caused almost a third of its sites to go down early on Friday morning. Affected sites included bank sites, the career social media platform LinkedIn and the virtual meeting service Zoom.

San Francisco-based Cloudflare said that up to 28% of its sites went down on Dec. 5 at 3:47 a.m. ET, after the company made changes to its systems , but said that it had fixed the problem within 25 minutes.

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The problem occurred when Cloudflare increased the buffer designed to prevent a critical vulnerability. To facilitate the update, the company says i

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