Configure DCOM settings for the OPC server node

If your OPC server vendor recommends specific DCOM settings, be sure to follow those recommendations. If you are running an OSIsoft OPC server, or no specific recommendations are available from the vendor, configure DCOM settings for the user that runs the OPC server as described below.

By default, the dcomcnfg program does not display an entry for PI OSI DA Server or PI OSI HDA Server on the 64-bit version of Microsoft Windows 7 and Microsoft Windows Server 2008 R2. To ensure these servers are listed, issue the following command, which launches the 32-bit version of dcomcnfg:

MMC /32 %windir%\syswow64\comexp.msc

1. Launch dcomcnfg program and browse to Console Root > Component Services > Computers > My Computer > DCOM Config.

2. In the list of applications in the right pane, right-click your OPC server and choose Properties.

   The Properties dialog is displayed.

3. On the General tab, set Authentication Level to Packet Integrity.

4. On the Location tab, check Run application on this computer.

5. On the Security tab, set permissions as follows:

   • Launch and Activation Permissions: Use Default

   • Access Permissions: Use Default

   • Configuration Permissions: For OPC users, Allow Read; for OPC Administrators, Allow Read and Allow Full Control.

6. On the Endpoints tab, add Connection-oriented TCP/IP to the protocol list.

7. On the Identity tab, choose the This user option and enter the user name and password for the OPC user you created.

8. Click OK to save your settings.