Open Application Reference Error 56 Not Connecting After Update

[wesdeeg]

Hello! 

I'm asking for some aid in a problem that my research group is having with remote connecting to another computer in our lab. We are utilizing a SmarAct HCU-3CX translational stage which is controlled through another computer in the lab, but we would like to remote access that computer to run the program without having to switch which computers the stage is connected to. We have been utilizing a labview program that I have included below, which was working until a few months ago. At that time, the computer the SmarAct stage is connected to was updated, and now this implementation no longer works. 

We are currently using Labview 2017, and if anyone knows about connectivity issues with Windows updates, help would be greatly appreciated. I have tried the old machine name for the computer as well as verifying in system information and trying the names listed there, and all have returned this same error.

[rolfk · Accepted solution]

Most likely this is a firewall issue. Without an “allow rule” for TCP/IP for the executable that runs on that computer the LabVIEW app will simply be connected to a big black hole that swallows any packets from either side.

[wesdeeg]

Apologies for the late reply. That seems logical, that the update changed some firewall settings. Is there a way within Labview to change those settings to allow for TCP/IP connections, or is that something I'd have to try and do in the windows settings?

[rolfk]

LabVIEW, and other applications have no business to mess with Firewall settings. If they could, imagine how useful a Firewall would be if trojans and viruses can just change their settings at will. You have to go into the Firewall settings in Windows yourself and change them.