Network File Copy (NFC) provides a file-type-aware FTP service for vSphere components. Starting with vSphere 5.5, ESXi uses NFC for operations such as copying and moving data between datastores by default, but you might have to enable it if it is disabled.

When SSL over NFC is enabled, connections between vSphere components over NFC are secure. This connection can help prevent man-in-the-middle attacks within a data center.

Because using NFC over SSL causes some performance degradation, you might consider disabling this advanced setting in some development environments.

Note: Set this value to true explicitly if you are using scripts to check the value.


  1. Connect to the vCenter Server with the vSphere Web Client.
  2. Click Configure.
  3. Click Advanced Settings and enter the following Key and Value at the bottom of the dialog.
    Field Value
    Key config.nfc.useSSL
    Value true
  4. Click OK.