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Unable to browse for items to import with the OPC DA Client Driver

I am unable to browse for items to import with the OPC DA Client Driver, but if I manually add the items, I am able to view them through my client without issue. What could be causing this?

We have seen cases in the past, where the OPC DA Client driver is used to connect to certain OPC Servers that require clients to be running as a specific user.  To make this work, the TOP Server runtime service is set to run as that specific user.

However, the "Select Items to Import" option when configuring the device properties for the OPC DA Client Driver runs as a part of the TOP Server Configuration executable, and not the TOP Server runtime service.  This means that items that were manually added to the DA Client driver would work without problems, but using the TOP Server Configuration to try to browse for items to import from the target OPC server would fail.

To resolve this issue, simply run the TOP Server Configuration executable ("server_config.exe") as the user that is required by the target OPC Server.