ENI got detached from FSx

Question

I have an FSx for Windows file server which was working fine for more than an year. Somehow the ENI got detached from the FSx automatically and the file system went to misconfigured state suddenly.

Please let me know if there is a way to reattach it or get the FSx back to working state.
I tried to create new FSx from Backup but it always fails with the error insufficient permissions or connectivity to Active Directory. Though we use the Service Account with necessary permission and the connectivity to AD is fne.

Answer

FSx is managed service, so you can not change the configuration of resources (like ENIs) that are part of it :-( You should either contact AWS support or create a new file server, copy your data and delete the broken one (assuming you can still access data on current file server).

ENI got detached from FSx

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