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DCOM hardening: impact on local client-server communication

Frank Zettier

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09/12/2022 - 06:55

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

Randy Armstrong

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09/12/2022 - 15:16

It should work without changes for localhost connections but that is not a guarantee.

You need to test.

Frank Zettier

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09/15/2022 - 03:13

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

Randy Armstrong

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09/15/2022 - 14:02

Theoretically that should be enough but others with more experience testing legacy DCOM based software may have something to add.