Dcom security and Configuration
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dcom security and configuration 12-19-2022
Navigate this page:
Console Root > Component Services > Computers
Default Authentication Level to Connect .c. Set Default Impersonation Level to Identify
Limits and Defaults
Parent topic:
Configuring
operating system settings
Configure DCOM settings for the OPC client node
On client computers that access OPC servers, you must enable DCOM and grant appropriate account access.
Note: The procedure below provides general instructions for configuring DCOM settings for the OPC client node.
It is likely that your company's IT specialist will need to consult with your OPC
server vendor to identify the
DCOM settings required for your security arrangement. Error codes generated by the OPC foundation will help to determine your correct DCOM configuration.
To configure the required settings, perform the following steps:
Procedure
1. Ina command window, issue the dcomcnfg command. The Component Services window is displayed. Expand
Console Root
>
Component
Services
>
Computers
, right-click
My Computer
and then click
Properties
.
3. In the My Computer Properties window, click the
Default Properties
tab and set the appropriate settings:
a. Select the
Enable Distributed COM on this computer
checkbox if the
OPC client must connect to an
OPC server running on a different computer. DCOM can be disabled if the client and server run on the same computer. Disabling DCOM is secure but doing so disables many remote management functions.
b. Set
Default Authentication Level
to
Connect
.
c. Set
Default Impersonation Level
to
Identify
.
d. If the OPC user account
is a local user account
, click the
COM Security
tab, and add the account to the appropriate access control lists (ACLs) as follows Under
Access
Permissions
, add the user (and
Page 13
©2022 AVEVA Group plc and its subsidiaries. All rights reserved.
DCOM Security and Configuration
DCOM configurations for OPC
the OPC administrator) to both the
Limits
and
Defaults
ACLs. Set
Access Permissions
for the default users and groups as follows:
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