Incident Library

Component

Host routes and routing rules

호스트 라우팅 규칙 · host-routing

3 cases · 2025 to 2026

Root cause Faulty deployment1Software defect1Breaking change in an upgrade1
Contributing factor Unverified assumption1Circular dependency1Unreviewed defaults1Limited debug access1Gap in automated tests1Unpinned version1
Symptom Network unreachable2High error rate1Link flapping1Misrouted requests1Service outage1Training job failure1
Organisation Fly.io1Heroku1Infrawaves1

Cases, by severity

  1. IL-0354 Fly.io private networking (6PN) broke for some machines after edges received gateway /80 routesFly.io · 2026

    Root cause Faulty deployment

  2. IL-0481 RoCEv2 GIDs changed after RNIC port flaps, collapsing the communication collective and crashing LLM training jobsInfrawaves · 2026

    Root cause Software defect

  3. IL-0227 Most Heroku dynos in Private Spaces lost outbound connectivity after an automated OS update restarted host networkingHeroku · 2025

    Root cause Breaking change in an upgrade

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