Windows reports error 0x80040202 as: An event was delivered but there were no subscribers. Programmers know this error as EVENT_S_NOSUBSCRIBERS.
This error typically occurs when trying to establish a subscription (advise) call with an OPC server. This error occurs after establishing a connection with an OPC server. During this error condition, OPC client applications are able to establish an OPC server connection. However, callbacks do not reach the client computer. This could be caused by a variety of issues such as firewall, network connections, DCOM permissions, user accounts, etc. Windows Registry problems do not cause this error.
To automatically repair error 0x80040202, download OPC Expert (www.OpcExpert.com), and run it on affected computers. OPC Expert will provide full repair instructions. OPC Expert also enables users to view OPC server data, connect OPC to Excel, trend values, and more.
In addition, consider OPCTI's training classes (physical and online) at http://www.opcti.com/Training-Schedule.aspx
If you are unable to find the right answer for your situation, please contact us and we will help you make the connection.