Application note: Mitigation for
Microsoft
 DCOM Hardening patch

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 was raised to Packet Integrity.
IMPORTANT:
Installing this product’s latest version with earlier unpatched versions of other
FactoryTalk
 products or products using Classic OPC DA connections may cause a loss of connectivity due to the difference in DCOM authentication level used. For additional information, see the Knowledgebase Document ID: 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 Knowledgebase 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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