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Check that security group outbound rules allow the necessary ports and that both the NAT Gateway and Internet Gateway are properly configured.
Network changes not taking effect
VPC networking changes can take 1–2 minutes to propagate. Wait before testing after creating a NAT Gateway or updating route tables.
Route table association issues
Confirm the Lambda function's subnets are associated with the route table that has the 0.0.0.0/0 route to the NAT Gateway.