AWS Cost Lesson: How a Missing VPC Endpoint Led to $1,000 in Unexpected Charges
By
thecodemonkey
A baker's-dozen of insight crammed into one ring.
Summary
A developer shares a cautionary tale about accidentally incurring $1,000 in AWS charges due to a missing VPC Endpoint configuration. The article explains how data transfers from EC2 instances to S3 were routed through expensive NAT Gateways instead of using the free VPC Endpoint service, resulting in unexpected costs. The author provides technical details about AWS networking, VPC configurations, and lessons learned about monitoring and cost optimization. An update reveals AWS ultimately refunded the charges after understanding the oversight.
Key quotes
· 3 pulledUpdate (January 7, 2026): Good news! AWS ended up refunding the entire amount after we explained what happened. Their support team was surprisingly understanding about our VPC Endpoint oversight.
A cautionary tale about AWS VPC networking, NAT Gateways, and how a missing VPC Endpoint turned our S3 data transfers into an expensive lesson.
I've been using AWS since around 2007. Back then, EC2 storage was entirely ephemeral and stopping an instance meant losing all your data. The platform has come a long way.
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