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Troubleshooting in OPC Toolbox

Unable to Find an OPC Server

First, check that you are able to communicate with the host from your client.

"Class not registered" Error

If you get this error while attempting to query a server using opcserverinfo, or when attempting to add a host in the OPC Data Access Explorer app, the OPC Foundation Core Components have not been installed correctly.

Unable to Query the Server

If you are unable to query the server using opcserverinfo, the most common cause is incorrectly configured local DCOM security settings.

Unable to Connect to Server

An inability to connect to the OPC server usually indicates that the security model on the server is not allowing you to make an initial connection.

Unable to Create a Group

If you are able to connect to the server but cannot create a group, the most common cause is incorrectly configured local DCOM security settings.

Error While Querying Interface

If you get this error while attempting to add a group to a connected client object,

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