Mode Z compression compresses files on the fly for file transfers, saving bandwidth and improving transfer times. The client must also support MODE Z to take advantage of this feature. If MODE Z is enabled, EFT Server will listen for MODE Z requests, then enable it for subsequent transfers from the client that requested it.
To allow a client to use Mode Z compression
In EFT Administrator, connect to EFT Server and click the Server tab.
In the left pane, click the user or User Setting Level you want to configure.
In the right pane, click the Security tab.
Select the Allow MODE Z Compression check box.
Click Apply to save the changes on EFT Server.