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Hello.
First, we need to find out which resource the network interface is associated with.
For example, are there any EC2s, ALBs, other VPC endpoints or NAT Gateways left?
If you were using something like RDS Proxy, you need to remove RDS Proxy.
Have you ever created a Lambda connected to a VPC?
If these resources remain, the network interface cannot be deleted unless they are deleted.
https://repost.aws/knowledge-center/troubleshoot-dependency-error-delete-vpc
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There are no Endpoints, and no NAT Gateways left, I followed that link you suggested and got, the InternetGatewayId, SubnetId, RouteTableId, NetworkAclId, GroupId, and NetworkInterfaceId. What order should I delete these in?
Follow the steps below to check the ENI description and see which resource it is linked to. After checking, delete the linked resources.
Ok, I did that, I can now see the interface ID, VPC ID, status, type, subnetID and Securitygroup, attachmentID. I cannot delete the subnetID or Securitygroup though. Is there something I am missing?
Delete the resources using that ENI first.
Hi Riku, thanks for your responses, figured it out