OFS Server can operate in remote mode (the OPC client and the server are on different machines connected by DCOM generally via TCP-IP)
To allow the connection for only a specific user, the following setting can be applied:
Steps to follow:
- From the Start menu, choose Run and run DCOMCNFG
 - Expand Console Root/Component Services/Computers/My Computer and
 - right-click My computer to open the My Computer Properties dialog.
 - Click the Default Properties tab.
 - The following parameters must be set:
 - Enable Distributed Com on this computer must be checked,
 - Default Authentication Level is set to Connect,
 - Default Impersonation Level is set to Identify.
 
- Click the COM Security tab.
 - Click the Edit Defaults in Access Permissions
 - Click Add, add the user required (example: L3), click OK.
 - Check that permissions for user required are:
 - Local access: Allow checked.
 - Remote access: Allow checked
 
- Delete « Everyone » if it exists
 - Delete « INTERACTIVE » and « NETWORK » if it exists
 - Click the Edit Defaults in Launch and Activation Permissions
 - Click Add, add the user required (example: L3), click OK.
 - Check that permissions for user required are:
 - Local Launch: Allow checked.
 - Remote Launch: Allow checked.
 - Local Activation: Allow checked.
 - Remote Activation: Allow checked.
 
- Delete « Everyone » if it exists
 - Delete « INTERACTIVE » and « NETWORK » if it exists
 
Product line
OFS 3.63 SP3
Environment
Windows 10