Incident Library

Component

DDoS protection service

DDoS 방어 서비스 · ddos-protection

2 cases · 2016 to 2024

Root cause Configuration change1Dependency failure1
Contributing factor Excessive blast radius1Limited debug access1Monitoring blind spot1Overlapping failures1
Symptom High latency1Intermittent connection failures1Intermittent timeouts1Network unreachable1Packet loss1Service outage1
Organisation Fastmail1Microsoft Azure1

Cases, by severity

  1. IL-0339 Azure Front Door and Azure CDN users saw intermittent connection errors, timeouts and latency spikes for hoursMicrosoft Azure · 2024

    Root cause Configuration change

  2. IL-0258 FastMail was unreachable for almost two hours when the GRE tunnels carrying its traffic from Level 3 went downFastmail · 2016

    Root cause Dependency failure

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