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Just realized the HCA message has the device address and they are the same. Assuming the same PLC is being used the SDM3 interface is where to look next. Click on the blue T shaped Icon in the system tray. This will open the SDM3 window. Are the commands issued by the SHN Utility appearing in the SDM3 window? The fact that you have to manually start SDM3 before the PLC is accessible makes the configuration suspect. It sounds like the SDM3 files are installed in the HCA directory rather than in a common place.

Try copying the sdm3 exe into the directory where the SHN Utility is installed.