That is the correct APN for T-Mobile as far as I know and normally nothing is blocked on the T-Mobile end when connecting through it.
I beleive that many Linux VNC servers run on slightly different ports (often 5901-5905) depending on the exact screen (or screen resolution) you are trying to connect to. Can you connect to your server on port 5900 using a desktop VNC client?
Can you tell me what errors you are encountering when trying to connect with Mobile Desktop?
Can you connect with VNC to mdtest.idokorro.com using Mobile Desktop? If you are prompted for a password then the connection was successful and it means that the problem is either at your server end rather than at your BlackBerry or with the IP Address or port that you are using to try and connect with.
If you need additional assistance you can contact Idokorro support directly at
and we will be happy to assist you.