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08/23/2022
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Hello everyone,
I´m new to OPC communication and since this dcom hardening patch affected my company in July 2022, I´m working on updating to OPC UA. At this time the registry entry keeps data flowing. We´re using some old Honewell software, which can only use OPC DA/HDA.
So my question is: do I have to update to OPC UA on a machine, where an OPC DA server and also the Honeywell software (with an integrated OPC DA client) are installed? So the OPC DA server-client connection is on the same machine. Does this scenario still work after MS has delivered the final patch (14.03.2023)?
Best regards for any information,
Frank
05/30/2017
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It should work without changes for localhost connections but that is not a guarantee.
You need to test.
08/23/2022
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Hi Randy,
thank´s a lot for your quick reply. I also checked some youtube videos from Rockwell and they say, that local OCP DA Server connections will keep working.
One more question regarding testing OPC hardening impacts:
Is it enough to change the registry value to “1” in “Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\AppCompat\RequireIntegrityActivationAuthenticationLevel” to enable the hardening or is anything else required?
best regards,
Frank
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