0x80040112 DCOM error (RSLinx OPC server): When connecting to Rockwell RSLinx OPC server, OPC Expert (and other applications) may show DCOM error 0x80040112.  This error specifically informs users their copy of RSLinx is not properly licensed by Rockwell.  Users who do not have a license should contact their Rockwell sales representative and purchase a license.  Users who believe they have a valid license, should check their Rockwell hardware key (dongle) and restart the computer (this is a common problem when trying to move licenses).  Note this license problem is not related to OPC Expert’s activation key.

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