In UMC, click File Access Protocols > NCP.
Click the Search icon and specify the server name.
or
Click Browse and select Server Type to list their associated servers. Select the required servers from the list, and then click APPLY.
Select the NCP share, click More Options icon, and then select Enable encryption.
In Enable encryption box, click Confirm.
This enables encryption on the selected share and only encrypted connections can access this share. This can be performed on multiple volumes at a time.
You can follow the same procedure to disable encryption if it is already enabled. When encryption is disabled, all connections are allowed to access this share.