TLS certificate expired
An internal API that other teams call started returning connection failures at 2:00am exactly. The callers' logs show TLS handshake errors mentioning an expired certificate, and browsers hitting the endpoint show a 'certificate expired' warning. The service process itself is up and healthy; only the TLS layer is failing. Nothing deployed recently. How do you confirm the cause and restore service?
What a strong answer looks like
Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.
0:00 of about 15 min
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.