Hi JKaranka,
There is a lot of info on setting up RDA on the website, it's well worth going through these setup procedures to double check eveything is working ok.
I must admit you are the first person I have heard of running the RDA across a firewire link. It should be compatible if you are ruinning through the TCP/IP protocol.
Try this setup and see how you get on,
http://zone.ni.com/devzone/conceptd.nsf/webmain/E74C1A78430F4397862568690075BF58?OpenDocument
It is also worth searching the knowledge base for RDA or Remore Device Access. Hopefully this can help narrow down your problem.
Best regards,
Matt Poole | Applications Engineer | National Instruments