Network misconfiguration causes massive outage at Cloudflare

Cloudflare suffered a massive outage on June 21, affecting numerous websites and services, including League of Legends, Steam, Discord, Gitlab, and more. The outage began at approximately 06:27 UTC and lasted an hour and a half. Cloudflare explained that the incident was caused by a misconfiguration of the network, a common mistake that leads to severe outages. Cloudflare said it modified its network configuration to increase resiliency, but ended up impacting 4 percent of its network, which in turn affected about 50 percent of the HTTP requests it handles.

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