Hi Slawek, Yes, you would want to have port 3363 (or whichever port you decide to use for TCP/IP communication) open while you are expecting information to be send from your client application.
For more information regarding TCP/IP and UDP in LabVIEW: <a href="http://digital.ni.com/public.nsf/websearch/56ECBF3428911D4F862569650052FDCD?OpenDocument";>KB 21O937LI. When to Use UDP Instead of TCP</a> <a href="http://zone.ni.com/devzone/conceptd.nsf/webmain/BA7F1D7CE009BE7686256A5B004F335D?opendocument";>Developer Zone Tutorial: Using LabVIEW with TCP/IP and UDP</a> Best of luck. Kileen C. Applications Engineer National Instruments
