DCOM errors typically begin with a "0x800" code. Specifically, DCOM Error 0x80070005 appears in OPC client applications when they try to connect to a server to which they are refused access. This error could be caused under several conditions. Read the full article to troubleshoot and repair this DCOM error. The OPC Training Institute’s website has a whitepaper that provides details on this error its various potential causes, and how to solve them using a step-by-step guide.