If your network utilizes a proxy server, then the Java client software that runs in each user's browser must be configured correctly if you make use of the Java applet to upload files as attachments, document fields and image fields. The behavior setting named UPLOAD_DISPLAY_SETTING controls whether or not your users can use the Java applet.
To configure the browser in order that applets can use a proxy server, you access the Java control panel. Within the control panel, access the Network Settings and provide the correct proxy server address and port. Remeber to restart the browser after saving these settings.
More information can be found at http://www.java.com/en/download/help/proxy_setup.xml.
