NAT gateway port allocation fails
Your fleet makes lots of short-lived outbound HTTPS calls to several third-party APIs and egresses through a managed NAT gateway. You scaled the fleet from 60 to 150 instances for a campaign; outbound success rate dropped and you see intermittent connection timeouts and resets to external endpoints. The third-party APIs are healthy and not rate-limiting you. NAT gateway metrics show `ErrorPortAllocation` climbing and active connection count near a ceiling. How do you triage and what's the durable fix?
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 30 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.