Incident Library

Organisation

Government Digital Service

Government Digital Service · government-digital-service

2 cases · 2016 to 2021

Root cause Cloud provider outage1Dependency failure1
Component CDN and edge network1VPC DNS resolver1
Contributing factor Signal buried in noise1
Symptom DNS resolution failures1Intermittent connection failures1Monitoring outage1Service outage1

Cases

  1. IL-0398 GOV.UK showed "Error 503 Service Unavailable" pages for under an hour during a global outage of its primary CDNGovernment Digital Service · 2021

    Root cause Dependency failure

  2. IL-0399 Applications on GOV.UK PaaS in AWS eu-west-1 failed DNS lookups intermittently for about two hours overnightGovernment Digital Service · 2016

    Root cause Cloud provider outage