Using CitectSCADA > Using OPC Server DA2.0 > Configuring Remote Access to the OPC Server > Windows 2000
Windows 2000

This section describes how to configure the OPC Client on Windows 2000.

To configure the OPC Client:

  1. Choose Start | Run. Type dcomcnfg and click OK.
  2. The Component Services dialog will appear.

  3. In the tree pane, locate and select Computers under Component Services.
  4. Right-click My Computer in the pane on the right, and choose Properties from the context menu.
  5. Select the Default Properties tab. Make sure the settings are adjusted as follows:

Enable Distributed COM on this computer


Enable COM Internet Services on this computer

not selected

Default Distributed COM Communication Properties

Default Authentication Level


Default Impersonation Level


Provide additional security for reference tracking

not selected

  1. Click Apply to save your changes.

    You need to edit the Access Permissions and Launch and Activation Permissions settings.

  2. Select the Default Security tab, and then click Edit Default in the DefaultAccess Permissions section.
  3. In the Registry Value Permissions dialog, select the user you want to edit permissions for and then choose Allow Access from the Type of Access menu.
  4. This setting is needed for OPCEnum.exe to function, and for some OPC Servers and clients that set their DCOM authentication level to None in order to allow anonymous connections. If you don't use OPCEnum.exe you might not need to enable remote access for anonymous users.

    Click Apply to save your changes.

    Now you need to edit the default launch permissions.

  5. Click Edit Default in the Default Launch Permissions section. Make sure the type of access for necessary users (including System and Interactive) is set to Allow Launch.
  6. Click OK to save your changes.

    You have now configured your OPC Client.

    Some older OPC Clients cannot locate CitectSCADA OPC Server on a client machine. If this is the case, copy the ctopc.reg file located in the bin directory to the client machine. Double-click the file to add OPC Server-specific data to the registry.

    Note: You need to restart this machine so that your settings can take effect.