DataChangedEventHandler Exception System.Runtime.InteropServices.COMException (0x80040202): Exception from HRESULT: 0x80040202 | Classic OPC: DA, A&E, HDA, XML-DA, etc. | Forum

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DataChangedEventHandler Exception System.Runtime.InteropServices.COMException (0x80040202): Exception from HRESULT: 0x80040202
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Stitch35
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06/13/2018 - 03:59
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groupRead.DataChanged += new Opc.Da.DataChangedEventHandler(groupRead_DataChanged);

System.Runtime.InteropServices.COMException (0x80040202): Exception from HRESULT: 0x80040202
at OpcRcw.Comn.IConnectionPoint.Advise(Object pUnkSink, Int32& pdwCookie)
at OpcCom.ConnectionPoint.Advise(Object callback)
at OpcCom.Da.Subscription.Advise()
at OpcCom.Da.Subscription.add_DataChanged(DataChangedEventHandler value)
at Opc.Da.Subscription.add_DataChanged(DataChangedEventHandler value)
at da.Form1.ConnectionToOPCServer()

Base on opc.NetApi

1.It can connect to server but it cannot get value form tag

2.OPCProxy.dll is same version between server and client 

3. I run with administrator

4.I test with application, it is work 

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Randy Armstrong
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06/13/2018 - 05:34
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This appears to be a DCOM permission problem.

The account that the Server is running under needs access to the Client process.

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Rudolf
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07/31/2018 - 07:28
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Hello Randy,

I am having same issue. May I ask you for a quick tip, how to "The account that the Server is running under needs access to the Client process."
I created on both systems same user added to Administrators group. Is there something else I need to do?
I went through DCOM configuration and it seems to be OK.

Thank you
BR Rudo

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Randy Armstrong
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08/01/2018 - 11:35
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Same user; Same password.

The client process needs to be launched as admin if the server was launched as admin.

Not enough to simply add to admin group.

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Rudolf
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08/06/2018 - 02:04
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