Hi Jo-Jo,
I was able to communicate through two ports using TCP with the TCP Communication - Active.vi and TCP Communication - Passive.vi NI Example Finder VIs.
The two ports I communicated across were 6341 and 6342. My Active VIs were on the host computer while the Passive VIs were on the cFP controller.
Are you doing something different with your program? It's entirely possible to do, so there appears to be something in your program that is not allowing this communication.
Michael K. | Applications Engineering | National Instruments
| Michael K | Project Manager | LabVIEW R&D | National Instruments |