The MDS is part of the BES and acts as a proxy between the handheld and external world - the Internet. MDS encrypts and compresses the traffic between the handheld and the server, so it is more secure and faster.
Blackberry Internet Solution. Requirements for OILwatch
To access OILwatch via the Internet solution requires direct TCP/IP connections.
You must be using BlackBerry OS version 3.8 or later.
Go to Settings/Options -> TCP (if you already have TCP APN details entered you do not need to change)
If you do not have TCPAPN username/password details entered you will need to contact your service provider and ask for them - they are generic to that provider and not user specific. Sometimes you can find APN settings on your provider's website.
Go to Settings/Options -> TLS -> TLS Default (make sure this is set to handheld)