Mitigation for Microsoft DCOM Hardening Patch
In response to Microsoft Distributed Component Object Model (DCOM) Hardening patch (MS KB5004442), the minimum DCOM authentication level used by Rockwell Automation products has been raised to Packet Integrity.
IMPORTANT:
Installing this product’s latest version with earlier un-patched versions of other FactoryTalk products or products that use Classic OPC DA connections may cause a loss of connectivity due to the difference in DCOM authentication level used. For additional information, see the Knowledge base Document ID: H_449959. IN39461 - Microsoft DCOM Hardening Information TOC.
Microsoft releases the DCOM Hardening patch in response to CVE-2021-26414. This patch elevates the minimum DCOM authentication level that is required to establish a DCOM connection. DCOM is used by many Rockwell Automation products and may be affected by the change that is made by the Microsoft patch. For additional information about the affected Rockwell Automation products, see the Knowledge base Document ID: PN1581 - Product Notification 2022-01-001 - Rockwell Automation products unable to establish proper DCOM connection after installing Microsoft DCOM Hardening patch (MS KB5004442).
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