Squish,
This forum is for CAN questions. I would strongly urge you to repost your question to the LabVIEW General category and this is a LabVIEW question.
Also, does the FTP Browser shipping example that comes with the Internet Toolkit work? If it does, then I would suggest studying that example. If it does not, then I would suggest reposting your question and giving much more detail about which VI is giving you the error and a general overview of the program.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask