Prerequisites

To configure DCOM, you must log into the computer with an account that has local administrator privileges. DCOM configuration depends on how the OPC server and OPC client are deployed:

• Same computer

  Even though OPC client and server programs running on the same computer do not use DCOM (Distributed COM) to communicate, COM security is still in play. The default settings should allow the interface to work. If instantiation/communication problems are encountered between the interface and OPC Server in this mode, review/configure the COM permissions. COM permissions are configured using the DCOMCNFG utility, as described in this guide.

• Different computers, same Windows domain

  Grant DCOM permissions to domain accounts.

• Different computers, no common Windows domain

  Grant DCOM permissions to identical local accounts on both the server and client computers.