OPC UA connection problem

[bfelber]

I have a problem connecting to an OPC UA server. I used the simplest version of NIs Example here

https://zone.ni.com/reference/en-XX/help/371618J-01/lvmve/establishing_connection_btwn_opcua_svr_cln...

but no matter what I do i get the error

-356653 The status of the OPC UA server is uncertain. 

I have tried setting the "trust all servers" to true, i have tried providing certificates... nothing works. Other software such as UA expert connects instantaneously without any issues. How hard can it be?

[m.beer]

We have the same problem here connecting to a B&R plc.

We tried different settings for authorization in combination with provided certificates, but this does not work at all.

Connection with UA expert works fine.

@bfelber: have you solved the problem in the meantime?

[bfelber]

Yes, we solved it by using the hostname "br-automation" - or whatever hostname is configured in automation studio - instead of the ip address. Just add the plc's ip to your host file in the system32/drivers/etc folder. With this workaround you should be able to connect to your B&R plc. I hope this will work out for you as well.

[m.beer]

Works perfectly, thank you very much!

For everybody else encountering this problem, see screenshot attached for solution.

[M.Abdulhadi]

Thank you very much guys! I had the same issue with B&R and now it has been solved 🙂

[Jennifer002]

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@diebestetest wrote:

Thank you very much guys! I had the same issue with B&R and now it has been solved 🙂

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we solved it by using the hostname "br-automation" - or whatever hostname is configured in automation studio - instead of the ip address. Just add the plc's ip to your host file in the system32/drivers/etc folder. With this workaround you should be able to connect to your B&R plc.

[gepponline]

Hi,
 I have the same issue with the same PLC brand, but this solution doesn't seem to solve.
Is there a particular syntax to edit the hosts file? A space between IP and description or a tab or something similar?
Do I have to reboot the system?
Now I don't get the connection error but I get a Timeout error so something is changed but still not solve.

[gepponline]

You said "whatever hostname is configured in automation studio", but I don't have automation studio, the PLC is from a third party company.
How to know what hostname is used? Can I find it using UAExpert?

[gepponline]

This is how I see my PLC on UAExpert.
What server endpoint URL should I place in my code?

[Andrey_Dmitriev]

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@gepponline wrote:

This is how I see my PLC on UAExpert.
What server endpoint URL should I place in my code?

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Interesting, never seen multiple entries as shown on your screenshot above.

This is how it looks from my side (and works).

I would like to recommend to connect by IP, the name probably may not be resolved properly: