Modbus TCP Master Do Not Work There Is Error -1967353902

Updated Apr 27, 2018

Reported In


  • LabVIEW Datalogging and Supervisory Control Module

Issue Details

I am using two LabVIEW examples: "Modbus Fundamental" as Modbus TCP master and "Modbus Simulator" as Modbus TCP slave. Both examples use LabVIEW DSC module with I/O server. When I run examples, error -1967353902 accures. How can I resolve this problem?


You should stop all Modbus TCP Master which using 502 TCP port or you must use other TCP port on your computer. You could  stop Modbus TCP Masters created by DSC I/O Server using NI Distributed System Manager. 

Additional Information

If you have deployed Modbus TCP master using I/O servers or other running Modbus TCP masters on your PC which using certain TCP port, you can't run any Modbus TCP with same TCP port.