AWS Lambda Timeout

A timeout is a symptom. Trace the invocation from trigger → initialization → application code → dependency → response.

Diagnose

• Compare average and p95/p99 duration with the configured timeout.
• Inspect logs for the last completed operation.
• Measure database, HTTP, S3, Bedrock, or other downstream calls independently.
• If Lambda runs in a VPC, verify the required private/public connectivity path.
• Check concurrency, throttling, and retry behavior.

Fix → Verify → Prevent

Fix the slow layer rather than blindly increasing the timeout. Verify with a representative request and add alarms around duration, errors, and throttles.