← 문제 라이브러리
Security Beginner 3 min

NET::ERR_CERT_DATE_INVALID: every visitor sees a certificate warning

Check the certificate's expiry date against the current time.

무료
시나리오

Since this morning every visitor to the shop sees a certificate warning. openssl shows the served certificate's notAfter=Sep 28 03:12:45 2026 GMT; `date -u` prints Tue Sep 29 01:20:11 UTC 2026.

먼저 볼 것
  • Understand the main investigation order for Security incidents.
  • Separate user-facing symptoms from the deeper technical cause.
  • Describe both quick recovery actions and follow-up improvements.
점검 체크리스트
  1. Summarize the symptom and the current impact first.
  2. Check recent changes before collecting deeper diagnostics.
  3. 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
Should I translate commands, logs, or product names?

No. Keep commands, logs, file names, APIs, and product names unchanged, then explain the reasoning in the selected UI language.

What should the answer focus on?

State the root cause, the evidence that supports it, and the safest recovery direction.

Why can the scenario remain in the original language?

The source scenario is treated as an incident artifact. Guidance, checklist, hints, and explanations can be localized around it.