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GL_107616944-Participant
4-Participant
July 18, 2025
Solved

Setting OPC DA for windows server 2022

  • July 18, 2025
  • 1 reply
  • 910 views

Hello Forum Members,

Is there any methode to setting OPC DA Client and DCOM setting in windows server 2022? I do setting dcom from kepserver manual book and only can browse OPC server tag. after import and look at quick client, all value in " BAD ".

Anyone can help?

Best answer by rajskumar

Hello,

You mentioned that you referred to the KepServer manual for DCOM configuration. Please note that the manual has been updated to include the latest hardening settings. Iā€™m also attaching a related article for more detailed guidance.

CS350729 - Unable to establish OPC DA communication after installing Microsoft DCOM Hardening patches (CVE-2021-26414) with PTC Kepware Products

If the issue persists after applying these settings, we recommend using a third-party tool such as OPC Rescue to help narrow down the root cause. Thanks

1 reply

R
rajskumar16-Pearl
16-Pearl
July 18, 2025

Hello,

 

Although you are able to browse the tags, DCOM may still be causing issues. To verify this, I recommend directly adding the target DA server in OPC Quick Client.

 

Please note that OPC Quick Client uses the logged-in user's credentials, whereas KEPServerEX runs as a service and uses the system account credentials. Windows security may block access unless application-level permissions are explicitly granted to the connecting client.

 

If the Quick Client connects successfully, it strongly suggests that a DCOM configuration issue still exists.

As a troubleshooting step, you may consider temporarily opening DCOM permissions to the fullest extent to test connectivity. This should only be done in a controlled environment and not in production, unless reviewed by qualified security personnel or a system administrator.

 

Please take a look at the following article for recommendations:

https://www.ptc.com/en/support/article/CS293793

If you are prompted to log in to view the complete article, you can use your MyKepware login credentials.

Thanks

G
GL_107616944-ParticipantAuthor
4-Participant
July 22, 2025

Halo,

I follow those setting and still get bad data. i read on other forum is because dcom hardening. what can i do?

R
rajskumar16-PearlAnswer
16-Pearl
July 22, 2025

Hello,

You mentioned that you referred to the KepServer manual for DCOM configuration. Please note that the manual has been updated to include the latest hardening settings. Iā€™m also attaching a related article for more detailed guidance.

CS350729 - Unable to establish OPC DA communication after installing Microsoft DCOM Hardening patches (CVE-2021-26414) with PTC Kepware Products

If the issue persists after applying these settings, we recommend using a third-party tool such as OPC Rescue to help narrow down the root cause. Thanks

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