You can't access your file system
There are a number of potential causes for being unable to access your file system, each with their own resolution, as follows.
The Elastic IP address attached to the file system elastic network interface was deleted
Amazon FSx doesn't support accessing file systems from the public Internet. Amazon FSx automatically detaches any Elastic IP address, which is a public IP address reachable from the Internet, that gets attached to a file system's elastic network interface.
The file system elastic network interface was modified or deleted
You must not modify or delete the file system's elastic network interface. Modifying or deleting the network interface can cause a permanent loss of connection between your VPC and your file system. Create a new file system, and do not modify or delete the FSx elastic network interface. For more information, see File system access control with Amazon VPC.