Troubleshooting guide

Creating connections

Fetching data using HTTP or TCP sockets

Java™ applications for BlackBerry® devices can use standard HTTP, HTTPS, and TCP socket protocols to establish

connections over the wireless network. When establishing the connection over the cellular network, an

application can use one of two wireless gateways to proxy the connection to the Internet or the corporate intranet.

You can design your application to rely on the default gateway that is available to the BlackBerry device user, or

you can customize your code to explicitly select a preferred gateway.

Explicitly selecting a gateway

Set up your application to use the preferred gateway for a connection and the default gateway only when the

preferred gateway is not available.

Using the BlackBerry Enterprise Server as an intranet gateway

Enterprise organizations host the BlackBerry® Enterprise Server behind their corporate firewall to let BlackBerry

devices access the corporate intranet. The BlackBerry Mobile Data System™ component of the BlackBerry

Enterprise Server includes the BlackBerry MDS™ Services, which provides an HTTP and TCP/IP proxy service to let

third-party Java™ applications use it as a secure gateway for managing HTTP and TCP/IP connections to the

intranet. When you use the BlackBerry Enterprise Server as an intranet gateway, all data traffic between your

application and the BlackBerry Enterprise Server is automatically encrypted using AES or Triple DES encryption.

Because the BlackBerry Enterprise Server resides behind the corporate firewall and provides inherent data

encryption, applications can communicate with application servers and web servers that reside on the corporate

intranet.

If your application connects to the Internet rather than to the corporate intranet, you might be able to use the

BlackBerry Enterprise Server that belongs to the organization as a gateway as well. In this case, network requests

travel behind the corporate firewall to the BlackBerry Enterprise Server, which makes the network request to the

Internet through the corporate firewall. However, enterprise customers can set an IT policy to enforce that the

BlackBerry Enterprise Server is the gateway for all wireless network traffic, including traffic destined for the

Internet.

If your application connects to the Internet and you are creating your application for non-enterprise

organizations, you can also use either the BlackBerry Internet Service or the Internet gateway of the wireless

server provider to manage connections.

Fetching data using HTTP or TCP sockets

Datagram connections

Using port connections