Symptom: The usual symptom for the 0x800401F3 DCOM error is an inability for an OPC Client to establish an initial connection with the OPC Server.
Cause: The 0x800401F3 DCOM Error occurs when the function CLSIDFromProgID is unable to determine an OPC Server's CLSID (Class ID) from the given ProgID (Program ID). The ProgID is used to identify an OPC Server's name. This is usually due to an OPC Server's failure to correctly register itself.
Repair Procedure: Assuming the OPC Server...
For automated troubleshooting, refer to OPC Expert, a software application to troubleshoot OPC connections. If OPC Expert fails to connect, it automatically informs you of the problem, diagnoses the cause, and suggests a solution. OPC Expert is free to download, does not require installation, and does not make any changes to Windows registry, so it is safe to use on your computer. Download at www.OpcExpert.com.
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