Hello,
I have some questions.

1. Is the target OPC server located on the same computer as your client app, or on a different computer (remote)? Is "MyIp" the proper name for the computer where the server is located?

2. Have you tried to read from some other OPC server, located on the same computer as the Matrikon simulation server?
2a. If yes, what were the results?
2b. If not, can you please test that, and let us know the results?

3. Which version of Matrikon simulation server you have installed?

4. You wrote "we no longer read data", but the error indicates that the methods called was for node browsing. Please clarify.

Best regards

Hello,
We have an application that reads data from server using QuickOPC version 5.54.1151.1.

After updating to version 5.63.215 we no longer read data, the error is:

An OPC operation failure with error ID 'HResult=0x80040154' occurred, originating from 'OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient' and with depth of 1. The inner exception contains details about the problem. -> OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException (0x80040154): Class not registered
+ This error may be caused by damaged or missing OPC Server registration on the specified computer.
It can also be due to a problem with OPC proxies/stubs, which can be resolved by installing OPC Core Components (from OPC Foundation).
+ The machine name was 'MyIp'.
+ The server class used was 'Matrikon.OPC.Simulation.1'.
+ Execution details: HasNativeClient=True, HasNetApiClient=True, ProcessBitness=32.
+ The client method called (or event/callback invoked) was 'BrowseNodes'. OpcLabs.EasyOpc.OperationModel.OpcException: An OPC operation failure with error ID 'HResult=0x80040154' occurred, originating from 'OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient' and with depth of 1. The inner exception contains details about the problem. ---> OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException: Class not registered
+ This error may be caused by damaged or missing OPC Server registration on the specified computer.
It can also be due to a problem with OPC proxies/stubs, which can be resolved by installing OPC Core Components (from OPC Foundation).
+ The machine name was 'MyIp'.
+ The server class used was 'Matrikon.OPC.Simulation.1'.
+ Execution details: HasNativeClient=True, HasNetApiClient=True, ProcessBitness=32.
+ The client method called (or event/callback invoked) was 'BrowseNodes'.
--- End of inner exception stack trace ---
at OpcLabs.EasyOpc.DataAccess.Implementation.ErrorTransformingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.EasyDAClientCompositor.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.CompositeEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ForwardingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ForwardingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ForwardingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ForwardingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ForwardingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.BrowsePathResolvingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.LicensingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.EasyDAClientCompositor.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.CompositeEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ErrorTransformingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.ForwardingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.Implementation.DelegatingEasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.EasyDAClient.BrowseNodes(ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, DABrowseParameters browseParameters)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.BrowseBranches(IEasyDAClient client, ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, String elementNameFilter, String vendorFilter)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.BrowseBranches(IEasyDAClient client, ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor, String elementNameFilter)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.BrowseBranches(IEasyDAClient client, ServerDescriptor serverDescriptor, DANodeDescriptor parentNodeDescriptor)
at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.BrowseBranches(IEasyDAClient client, ServerDescriptor serverDescriptor)
at MyApplication....:line 277

We have updated OPC Core Components to the latest version.
We also get the same error with the OPCDA Demo Application installed with QuickOPC-2022.1.

With rollback to 5.54.1151.1 it's working properly.

Do you have any advice ?

Best regards,
Stefano