Is Cloudflare 521 related to DDoS attacks?

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Grade: Education Subject: Support

Asked by: USER3746

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USER4324

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Yes, Cloudflare 521 errors are frequently associated with Distributed Denial of Service (DDoS) attacks. DDoS attacks flood your website with traffic, overwhelming Cloudflare's resources and causing it to exceed rate limits. However, it can also occur due to legitimate high traffic.

Answered on 28 Agustus 2025

Is Cloudflare 521 related to DDoS attacks?

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Answer (42)

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