You can configure the BlackBerry® MDS Connection Service and BlackBerry MDS Integration Service to use proxy servers to access web addresses on the Internet and your organization's intranet. You should use a proxy method that is consistent with the proxy method that other applications and servers in your organization use to access web content.
Proxy servers typically do not permit network traffic between servers that are on the same side of the firewall, so you can configure certain BlackBerry® Enterprise Server components to use a .pac file, or to access the Internet directly through a proxy server. You can also configure multiple proxy servers to manage traffic to specific web addresses, and you can specify URLs that the BlackBerry Enterprise Server components can access without using a proxy server.
The BlackBerry MDS Integration Service sends application updates and data to BlackBerry devices through the BlackBerry MDS Connection Service. The BlackBerry MDS Integration Service can only accept and respond to messages that it receives from a direct connection with the BlackBerry MDS Connection Service. If you configured the BlackBerry MDS Connection Service to use a proxy server, you must configure proxy rules to permit a direct connection between the BlackBerry MDS Connection Service and the BlackBerry MDS Integration Service. You cannot use a proxy server to exchange data between these components. If you use a .pac file configuration, you can change the .pac file to permit a direct connection between the BlackBerry MDS Connection Service and BlackBerry MDS Integration Service.