DCOM Configuration Tutorial OPC SERVER Computer Recommended Settings DCOM Tutorial Home This section provides general guidance for configuring DCOM to allow OPC software to interoperate. If you are not already familiar with the DCOM Config utility and how to launch it, please review the DCOM Config Utility Introduction.  Client Side DCOM Configuration Properties: Default Properties Tab 1. First, the Enable Distributed COM on this computer MUST be checked. 2. The Default Authentication Level should be set to None. 3. The Default Impersonation Level should be set to Identity OPC SERVER Side DCOM Configuration Properties: Default Security Tab It is on this tab that you tell the operating system who you will allow to access the OPC Server objects. OPC SERVER Side DCOM Configuration Properties: Default Security Tab - Default Access Permissions Dialog It is on this dialog that you will set who (i.e. users that remote OPC Clients are running under) will have access to the server. We recommend you add the following accounts to this list: Everyone Interactive System Network Guests Anonymous IWAM_<computer-name> * IUSR_<computer-name> * For each account listed above, set the "Type of Access" property to FULL CONTROL . * only applicable if IIS (Internet Information Services) will be making/receiving OPC calls. OPC SERVER Side DCOM Configuration Properties: Default Security Tab - Default Launch Permissions Dialog Add the same accounts as previously stated, configuring each account to receive the ALLOW setting for the "Launch Permission". OPC SERVER Side DCOM Configuration Properties: Default Security Tab - Default Configuration Permissions Dialog Again you will add the same accounts as previously stated, this time each account will receive the FULL CONTROL permission for the "Type of Access". OPC SERVER Side DCOM Configuration Properties: Default Protocols Tab Generally speaking, the protocols listed on here are not so important.. but if you have more than 1 listed, you should ensure TCP/IP is at the top of the list. Warning: contents of this tutorial are Copyright Software Toolbox, Inc. 2001-2002, and may not be reproduced in electronic or written form without written permission of Software Toolbox Inc. Anyone found copying copyrighted material from this site for use on another site will be prosecuted. You are welcome to link to this site from your site. The information in this article is accurate to the best of our professional judgement at the time of writing but is subject to change