[dvanvoorst]

It would be helpful to know what you've checked already, but I'll start with the basics.
Make sure the computer's IP address is compatible. It should be something like 10.41.11.5 or 10.41.11.6. You should be able to ping 10.41.11.2.
Also make sure you're firewall is turned off.
Make sure your computer is connected to the robot - try it with a cable if you're currently using wireless. (Make sure you set the appropriate interface's IP address).
If that doesn't help, let us know if you are able to ping it or not. And let us know if it has worked in the past from this computer, or another computer. Or try another computer.