Professional OPC
Development Tools


Online Forums

Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.

Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.

Do not use the Contact page for technical issues.

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

09 Nov 2022 05:34 #11194 by Nemcek

Please Log in or Create an account to join the conversation.

08 Nov 2022 07:53 #11192 by support

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.

- 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

Please Log in or Create an account to join the conversation.

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 {} OpcLabs.BaseLib.Xml.XmlQualifiedName2
Last edit: 07 Nov 2022 20:51 by Nemcek.

Please Log in or Create an account to join the conversation.

Moderators: support
Time to create page: 0.053 seconds