Hello, and thanks again for detailed information.

It looks like that the new "Access Denied" problem was introduced in an attempt to remove the need for configuring the DCOM security. I apologize for that. A fix has been made; can you please download the newest build 5.12.523.1 (from the same location as before) and try again.

Unfortunately, as you were not able to use the OPC Analyzer, I cannot tell more to the issue with "InvalidOperationException" during browsing righ now. Maybe if you get the new build working with the Analyzer, and capture the trace, that will tell us more. At the same time, can you please observe closely and determine whether the exception appears

• a) When expanding a branch in left tree view (e.g. clicking on "+" mini-icon)
• b) When selecting a branch in left tree view (e.g. clicking on a branch name there)
• c) When selecting a leaf in the right list view
• d) When pressing OK on the dialog.

With regard to OPC UA: OPC UA client cannot natively communicated with OPC "Classic" server such as OPC Data Access. It can be achieved by using a "proxy" which is OPC Data Access client, and at the same time it is a UA server.

Hello. Obviously I am sorry to hear this news.

As long as Matrikon OPC Rendundancy Broker exposes regular OPC server interface, it is possible to use OPC clients such as QuickOPC to connect to it and work normally. The principle is somewhat similar to OPC Analyzer: It is both client and server piece that sits "in between" - bu t we do not really care on the client side about these things.