Incident Library

Organisation

AdGuard DNS

AdGuard DNS · adguard-dns

1 case · 2025

Root cause Faulty deployment
Component Language runtime settingsRecursive DNS resolver service
Contributing factor Harmful manual actionRetry stormGap in automated testsDependence on a warm cache
Symptom DNS resolution failuresHigh latencyIntermittent timeoutsMemory pressure

Cases

  1. IL-0268 AdGuard DNS resolvers in Amsterdam, Frankfurt and London overloaded and answered with timeouts and SERVFAILAdGuard DNS · 2025

    Root cause Faulty deployment