시나리오
A new service answers `curl localhost:3000` on its host, but from a neighbouring server `nc 10.0.1.30 3000` is refused at once. `ss -lnt` shows it listening on 127.0.0.1:3000.
Connection refused only from other servers: curl works on the host
Check which address a service listens on.
단서
구독하면 이어서 볼 수 있어요
이 문제의 전체 시나리오와 점검 체크리스트, 복구 순서, 모범 풀이는 Pro 구독에서 열립니다.
먼저 볼 것
- Understand the main investigation order for Network incidents.
- Separate user-facing symptoms from the deeper technical cause.
- Describe both quick recovery actions and follow-up improvements.
점검 체크리스트
- Summarize the symptom and the current impact first.
- Check recent changes before collecting deeper diagnostics.
- Verify config, runtime state, and recovery path in order.
복구와 재발 방지
Write down the minimal recovery path first, then capture the improvements that reduce repeat incidents.
같이 보면 좋은 질문
No. Keep commands, logs, file names, APIs, and product names unchanged, then explain the reasoning in the selected UI language.
State the root cause, the evidence that supports it, and the safest recovery direction.
The source scenario is treated as an incident artifact. Guidance, checklist, hints, and explanations can be localized around it.
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