The originating error message is "The RPC server is unavailable.".
Please make sure you have configured the firewall and DCOM as necessary. You can use the information listed here: www.opclabs.com/forum/feature-requests-product-improvement-i...iguration-for-opc-classic#2338 .

In your case, with the RPC error, start with looking at the firewall issues first.

Best regards

What are the details of the exception? Especially, the full message, and its Source and InnerException?

For what needs to be installed on the client machine (where your application with QuickOPC is), see the Concepts document, section Application Deployment. The document is installed with the product and available then from the Start menu, or online here: www.opclabs.com/files/documents/QuickOpc/Latest/Concepts-QuickOPC.pdf .

The remote machine (where the other OPC servers reside) generally needs "OPC Core Components" - the redistributable is included with QuickOPC installation as well, or can be obtained from OPC Foundation: opcfoundation.org/developer-tools/developer-kits-classic/core-components/ . Normally, however, they are installed together with any OPC server on that machine, so you do not have to do anything in addition.

In your situation, it is far more likely that the problem is in DCOM configuration, rather than in a missing deployment piece. We need the exception details as described above, however, to be able to proceed further.

Best regards