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How to restrict OFS-DCOM connection to a specific user?

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.

dcom

  • 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

dcom

  • 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.

dcom

  • Delete « Everyone » if it exists
  • Delete « INTERACTIVE » and « NETWORK » if it exists

Product line

OFS 3.63 SP3

Environment

Windows 10

Schneider Electric India

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