Adding File Storage to a Network Security Group

Create an NSG with the required security rules.

(Alternatively, you can add them to a previously existing NSG.)

Controlling Traffic with Network Security Groups

Add the mount target (or more specifically, the mount target's VNIC) to the NSG.

You can do this task when you create the mount target, or you can update the mount target and add it to one or more NSGs that contain the required security rules.

Adding a Mount Target to a Network Security Group

If you're setting up a mount target and instance in different subnets, add the instance (or more specifically, the instance's primary VNIC) to the NSG that contains the required security rules.

You can do this task when you create the instance, or you can directly update the instance's primary VNIC.

Updating a VNIC