I have a two computer net. They are sharing tags. Computer A can read tags from Computer B but not the opposite way. They was working correctly, but they don't work now. It seems a problem of servers.
Make sure that you have the right DCOM settings on the computer that cannot be accessed. You might not have the rights to access the LabVIEW OPC Server residing on this machine.
There is a Document in the NI Developer Zone that explains how to access a remote OPC Server from LabVIEW DSC. The name of the document is:
Accessing a Remote OPC Server Using the LabVIEW DSC Module