Setting OPC DA for windows server 2022

[GL_10761694]

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?

[rajskumar]

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

[GL_10761694]

Halo,

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

[rajskumar · Accepted solution]

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. I’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