MDA usually operates in closed enterprise networks without access to the internet, and often even without a market application like Google Play installed on the devices.
In order to still make it easy to install and update the application, it has the capability to update itself, using http(s) requests to retrieve updated MDA.apk files.
The configured base URL for updates needs to point to some static webspace within the closed network, where the preferred version of the MDA.apk file is available for anonymous download by the devices.
To protect our intelectual property, this webspace must not be accessible to the public!
We recommend to restrict access to the IP ranges assigned to the actual Android devices running the application.