Thank you very much for your help, by setting the three following parameters to true we got our first success:

EasyDAClient.ClientParameters.UseCustomSecurity = true
EasyDAClient.ClientParameters.TurnOffActivationSecurity = true
EasyDAClient.ClientParameters.TurnOffCallSecurity = true

Now we can read and write OPC Items.


But we still run into another Problem:

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We are using the ItemChanged Event to get informed about changes on the server side. It’s done by the following line of code:
opcClient.ItemChanged += WhenOpcItemChanged;
opcClient is of type: EasyDAClient

In the event handler “WhenOpcItemChanged”, first of all we check the parameter “EasyDAItemChangedEventArgs”.

The property “Exception” of this parameter gives us the information: “Access denied” ({[ItemId="General.DataPump.Data"] *** System.UnauthorizedAccessException: Access is denied. })

So it seems that the way from our client to the server works fine, but as soon as the server would like to give back some information (in this case about the item “General.DataPump.Data”) we are running into a access denied failure.

So obviously a security problem again.

Maybe we have to add an additional user to the DCOM security as well.
Can you tell us which users are necessary to have DCOM rights?

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All tests are done with the Version 2018.2!

Thank you so much,
Markus

We are using QickOPC 5.2 - but this will not work on Windows 10 - right?
So we have tu upgrade onto a newer Version.

We have been testing QuickOPC 2018.2. but we cant get running the demo application.

We can get access to the server class, but as soon as we press the button "Browse items" we will get the "Access is denied" error. See the two screen shots added onto this topic.

Our Network Administrator told me, that according to documentation COM/DCOM is configured correctly.

Also another program on the same machine, which also communicates via OPC (but not via your product) can access the same Server Class without problems.

Can you please give us a hint, where we could focus on to get your demo application running? Thats important for us to make the upgrade decision.

Thank you very much,
Markus