Configuring Database Server settings : Database Server security settings : Security connections and progressive downloads
 
Security connections and progressive downloads
FileMaker Server supports progressive download of audio, video, or PDF files stored in an interactive container field.
Note  For more information about interactive container fields, see FileMaker Pro Help.
When the FileMaker Server setting Require secure connections is not selected:
The connections that FileMaker Server uses to transmit data are not encrypted during transmission.
If the files in the container field are embedded or stored externally using secure storage, FileMaker Server decrypts the container field data to a cache folder on the server when a FileMaker Pro, FileMaker Go, or web client requests the data. The data may remain decrypted in the cache folder on the server for two hours, until FileMaker Server periodically empties the cache folder.
For container fields that have open storage selected, FileMaker Pro doesn’t encrypt the data.
FileMaker clients see the interactive data with little delay. The data is not cached locally.
When the FileMaker Server setting Require secure connections is selected:
FileMaker Server uses secure connections to transmit data, which is encrypted during transmission, between the Database Server and FileMaker Pro, FileMaker Go, or FileMaker Web Publishing Engine.
FileMaker Server doesn’t create a temporary cache file on the disk before transmitting data.
FileMaker clients completely download the container data before the user can interact with it. The data is as secure as if the solution were stored in a local database.
Note  If you change the Require secure connections setting, you must stop and start the Database Server again for the change to take effect.
Related topics 
Auto Start settings
Admin Console settings
Configuring Database Server settings
Securing your data
CERTIFICATE command