If you want to use the DME AppBox functionality, a DME AppBox Gateway (also known as G/On server) is required as part of a DME Server 4.0 installation. The AppBox Gateway controls access to DME AppBox apps. For more information about the DME AppBox, see AppBox settings.
The AppBox Gateway is typically installed in the DMZ, has an inbound connection from the DME server and an outbound connection to the devices. Furthermore, it requires access to a web server and the user directory.
For more information about installing and configuring the DME AppBox Gateway, please see the reference material in the DME installation checklist at the DME Resource Center.