OPC Server Computer Recommended Settings - Step 2 This section covers the DCOM settings for the OPC server computer that are specific to your OPC server. You should already have the DCOM Config Utility running and go to the Applications tab. Server Specific Properties: General Tab On the General Tab, we recommend that you leave the Authentication level to None. We do NOT recommend that you change this setting unless you know what you are doing or are directed to by one of our support engineers. Server Specific Properties: Location Tab Make sure that the Run application on this computer is the ONLY check box checked. Server Specific Properties: Security Tab Because we have configured our default/global DCOM security permissions in such a way that reduces the security, we can simply specify that this server will inherit its permissions from these default settings. The window shown below is what you would typically see: All 3 of these options should be set to USE DEFAULT ... PERMISSIONS. Server Specific Properties: Identity Tab On the Identity tab, you specify under what user account you want the OPC server to run under.  This is probably one of the MOST important settings for the OPC server in some cases. Choose the Interactive user, or choose "This user" and specify an account. Absolutely DO NOT choose the "Launching user". TOP Server: If running without any user logged in on the OPC server computer, we recommend that you run the server as a service - this is done by clicking on Tools->Options from the TOP server.  This automatically requires that it runs with the System account, which is good. INGEAR OPC Servers: Running as a service is not available, so if you will not have someone logged into the computer when remote clients are connecting (i.e no OPC client running on the machine where the OPC server is located), we recommend running as a named user who has appropriate rights to Launch the OPC server. Server Specific Properties: Endpoints Tab - No changes required on this tab. 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.