LabVIEW OPC UA Disconnects with multiple NICs

[Barry Cousins]

Hi 

I have LabVIEW application as an OPC UA client connecting to OPC UA server on an ethernet port subnet which has no internet connected (128.x.x.x)

Every time I try to connect to another network (with internet) be it WiFi or another ethernet adapter, LabVIEW OPC disconnects and will not connect. While LabVIEW OPC does not connect I can confirm it can still ping the OPC server and connect using other third party clients such as UA expert.

As soon as I disconnect the non-OPC network it reconnects successfully.

I have tried changing the metric on the network adapters, changed routing tables to force the correct adapter, made the network private to no avail.

So something specific to LabVIEW is causing it to select the incorrect network interface card (NIC).

Any help would be greatly appreciated