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Remote DA or A&E server
May 24, 2022
19:21, EEST
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rvdborn
Utrecht, Netherlands
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November 11, 2020
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Hello,

To my great distress I found in the documentation (section Limitations) of the latest version (1.5.10) of the UA Gateway a blown up version of the earlier:
No Remote DCOM Connections
Apparently I wasn’t the first to have missed the old two-liner version of this section (or why would blow it up with a hure picture and more warning texts)
To my knowledge this quite severe limitation is nowhere else mentioned. It is also quite odd, as the whole idea of DCOM (D for Distributed) is to have remote connections.

The text however is less definitive than the old one. Actually the new text doesn’t say it cannot be done, just that it isn’t supported.
Which means that someone knows, at least to some extend, how it can be done.

My problem is that I cannot place the UAGateway at the same server as the OPC server. There is a categorical NO there.
So if no remote connection is possible, UAGateway is useless to me and I have wasted quite a lot of money on it.

So my question is whether anyone can help me with or give me a hint or a direction to search on how to accomplish a remote DCOM connection.

May 25, 2022
16:02, EEST
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Jimmy Ni
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Hello,

Remote DCOM is not tested on UaGateway and is out of the scope for warranty or our technical support. Additionally, Microsoft is hardening DCOM connections in Windows due to security concerns, which makes DCOM connections even more troublesome. See https://opcfoundation.org/forum/classic-opc-da-ae-hda-xml-da-etc/microsoft-dcom-update/ for more details. Therefore, the generic recommendation is to always install UaGateway in the same computer with the OPC DA server.

However, with proper configuration, DCOM technically works on UaGateway. You can find some instruction on how to create a connection between a remote OPC COM DA server and UaGateway at https://documentation.unified-automation.com/uagateway/1.5.10/html/dcom_sec.html. Please note that this instruction is only intended to provide hints for the “out-of-support” use case and does not guarantee a successful DCOM connection.

July 20, 2022
15:51, EEST
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rvdborn
Utrecht, Netherlands
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Hello again,

I need to come back at this issue since Microsoft’s hardening of DCOM connections seems to have more impact than I thought at first.
It is not entirely clear to me whether UAGateway will continue to work remotely when the hardening requirements are enforced?
And I understand I need to change the DCOM configuration at the server side, but do I need to do anything at the UAGateway side?

Thanks,

Reinier

July 20, 2022
18:11, EEST
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Jouni Aro
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It should be enough to update UaGateway to the latest version.

On the server side, you have still the option to disable the hardening, until March 2023.

Once the hardening is applied, only clients that have been updated respectively, can connect. But as said, te latest version of UaGateway should work fine.

You can check this article that I wrote for more details.

July 21, 2022
18:58, EEST
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rvdborn
Utrecht, Netherlands
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Good to know.
Thank you very much, also for the article. Quite clear.

July 22, 2022
10:37, EEST
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Jouni Aro
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Thanks for the kind feedback. I am happy that you found it useful.

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