Local Security Policy Settings; Disabling Firewalls And Security Software; Restarting Opc Programs - ABB COM600 series User Manual

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3.6.3.3.
3.6.3.4.
3.6.3.5.
COM600 series, Version 4.1
External OPC Server User's Manual
Windows security policy, for example, because of too many
failed login attempts.

Local security policy settings

Depending on the current Windows security policy settings and Windows version, remote
users may be authenticated as Guest. As a Guest, the remote user is not authorized to
use OPC via DCOM unless the Guest account is given authorization (not recommended).
You can prevent remote users from being authenticated as Guest by modifying the local
security settings.
To modify the local security policy settings:
1. Select Start > Control Panel > Administrative Tools.
2. Open the Local Security Settings window.
3. Expand the tree view and select Security Options in the left-hand pane.
4. In the right-hand pane, scroll down to Network Access: Sharing and security
settings for local accounts and right-click it.
5. Select Properties.
6. Select Classic - local users authenticate as themselves.

Disabling firewalls and security software

Firewalls and other security software may block the connections needed by DCOM.
Therefore, you may need to disable them while configuring and testing DCOM. After
you have completed the DCOM configuration, enable needed firewalls and security
software again and make sure that DCOM communication still works. If the DCOM
communication does not work, the security software must be disabled or configured to
allow DCOM communication.
A built-in Windows firewall is enabled in COM600 by default. It should be disabled
before taking DCOM into use. For information on configuring the Windows firewall to
allow DCOM, see MSDN Library web site.

Restarting OPC programs

After you have configured all DCOM settings, close or terminate all affected programs:
•
the OPC client OPCS_CONN on the COM600 computer
• the OPC server processes and OpcEnum component on the OPC server computer
The existing DCOM connections with old security tokens may still be in use instead of
new ones created with the current DCOM settings from the Windows registry. Restart
both computers to ensure that the new settings are taken into use.
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