Folders can be configured to appear only to clients who have connected with a minimum SSL strength. If a client is not using SSL or is using a lower strength of SSL than is required, the folder is not displayed in the file listing and cannot be accessed.
To require a minimum strength of SSL for a folder to display:
If you specify 40- or 128-bit, the folder is not shown to clients connected without SSL or with an SSL strength lower than the specified strength.
Note: Minimum SSL strength to view affects FTP listeners only. Clients connected over SSH/SFTP can view the folder regardless of this option selection.