Incident Library

Component

On-premises load balancer

온프레미스 로드 밸런서 · on-premises-load-balancer

4 cases · 2018 to 2026

Root cause Capacity exhaustion3Software defect1
Contributing factor Circular dependency1Unknown limit1No headroom1Overlapping failures1Retry storm1
Symptom High error rate2High latency2Intermittent connection failures1Intermittent timeouts1Link flapping1Outbound connection exhaustion1Service outage1
Organisation 37signals1GitHub1Hosted Graphite1Woowa Brothers1

Cases, by severity

  1. IL-0262 Requests through one GitHub datacenter failed or slowed after its load balancer nodes ran out of network flowsGitHub · 2026

    Root cause Capacity exhaustion

  2. IL-0455 Calls from an AWS service through NAT Gateway to an on-premises service returned 5xx errors every busy weekendWoowa Brothers · 2020

    Root cause Capacity exhaustion

  3. IL-0256 Basecamp was fully down twice in two days as hardware load balancers crashed and routers lost sync after failover37signals · 2020

    Root cause Software defect

  4. IL-0492 Hosted Graphite's self-hosted load balancers hit their connection limit in an AWS outage, timing out its site and APIsHosted Graphite · 2018

    Root cause Capacity exhaustion

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