Article - CS350729

Unable to establish OPC DA communication after installing Microsoft DCOM Hardening patches (CVE-2021-26414) with PTC Kepware Products

Modified: 20-Oct-2023   

Applies To

  • ThingWorx Kepware Server 8.0 to 6.14
  • KEPServerEX 5.20.396.0 to 6.14


  • Will Microsoft's phased rollout of tightened DCOM security impact KEPServerEX?
  • Effect of the Microsoft DCOM update on KEPServerEX communications
  • Will the DCOM updates impact OPC UA/DA connections or any other protocols?

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