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I want to tell you about a production incident that still bothers me.
We had a payment processing system built on Lambda. Each function did one thing: validate the card, charge the customer, update the order, send the receipt, trigger fulfillment. Clean separation of concerns. Looked great on paper.
Then a Lambda timed out in the middle of the charge step....
Security Lists and Network Security Groups handle stateful packet filtering at the subnet and VNIC level. They are the right tool for controlling which ports and protocols reach a resource. What they cannot do is inspect the content of traffic, detect threats based on application-layer signatures, block specific URLs or FQDNs, or apply SSL inspection to decrypt and re-encrypt...