How I can delete a network interface that is connected with lambda function that does not exist anymore

Question

Hi there,

I have faced issues with removing my network interface. AWS console says it's attached to the lambda function but that function was removed several months ago ([screenshot](https://monosnap.com/file/MWsps8adGJQUDekOvz5JXISMLwakTn)) so I'm not sure what is wrong.

I've tried also some recommendations from https://repost.aws/questions/QUqNXHXZIPT7WFxmB4lCmaUA/cannot-delete-network-interface by trying to detach it but I still have no luck with that.

`admin@ip-x-x-x-x:~$ aws ec2 detach-network-interface --attachment-id ela-attach-06300c91f31880db9 --region=us-east-1 --force`

`An error occurred (OperationNotPermitted) when calling the DetachNetworkInterface operation: You are not allowed to manage 'ela-attach' attachments.`

Could you please let me know what else I need to try?

Accepted Answer

Hi,

The section 'Resolution' of https://repost.aws/knowledge-center/lambda-eni-find-delete should provide with the solution to delete the ENÌ.

Best,

Didier

Answer

Thanks, @Didier. I think I know the issue.
I've several other Lambda functions in that VPC and somewhere in the docs, I saw that Lambda shares ENI with other functions in the same VPC.

How I can delete a network interface that is connected with lambda function that does not exist anymore

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