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OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException (unexpected)

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09 Nov 2022 05:34 #11194 by Nemcek

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08 Nov 2022 07:53 #11192 by support
Hello.

As far as I can tell, the client side (QuickOPC) is working as expected. This is an error given to us by the COM/DCOM infrastructure, and it indicates what it says - and it relates either to the target OPC server, or the OPCEnum service on the target computer. The client code code cannot do much about it, except reporting and retrying.

Hints:
- Check the target computer Windows logs around and before the time the problem occurred.
- Check how the OPC server is configured in DCOMCNFG. Is it set to run as a service? If so, under which user account? If it is a specific account, is it correct one? If it is something like "Interactive User", or "Launching User", then it could be a problem too, because these can change depending on either who is logged in (or nobody), or who is the OPC client (which can change).
- Check the same in DCOMCNFG for the OPCEnum service.

Best regards

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07 Nov 2022 20:48 - 07 Nov 2022 20:51 #11190 by Nemcek
I have today encountered this weird and unexpected error. The app has worked without a problem for a few months before.
Google did not find anything useful. All advises are welcome!!!

InnerException (System.Exception) {"The service did not start due to a logon failure.\r\n+ The client method called (or event/callback invoked) was 'WriteMultipleItemValues[1]'."} System.Exception {OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException}

QualifiedName {opcfoundation.org/DataAccess/:E_FAIL.0x8007042D} OpcLabs.BaseLib.Xml.XmlQualifiedName2
Attachments:
Last edit: 07 Nov 2022 20:51 by Nemcek.

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