Hello.

I am little stuck in WinCC 7.5 SP2 OPC UA server. My WinCC application has server redundancy with two clients. PLC is also redundant and communication for the red PLC was done by WinCC dynamic wizard. However the redundancy is working fine.

But the problem is my OPC UA server is discoverable which I can discover by OPCScout or other OPC UA client. For OPC scout it is showing bad certificate. Documents I read were for winCC 7.4 and their certificate folder is different. I am not sure how to fix this certificate issue in WinCC 7.5 Sp2. Though I want to browse data in none security anonymous mode. 

Using OPC Scout even from the same PC, I can browsing sever and some server data is available but could get anything form "@LOCALMACHINE"  folder. 

But if I open a new project and browse for OPC UA then I can get everything properly.

As I knew I cannot on/OFF opc UA server, it will run automatically with runtime, then what is wrong with my project.

Much appreciate your help guys.

Hi,

Thank you for your help.

I deleted the certificates from OPC UA server and from WinCC Client and created new certificates as per this link CA certificates of the OPC UA

Even though no luck. If I try OPC scout from same Server PC then it doesnot show any certificate error but I cannot get anything in "@LOCALMACHINE".

And If I use OPC scout from another PC(win winnCC or without any winCC) it shows  certificate not found in the specified store. Now what is the specified store for client certificate?

And also where a stand alone OPC scout is installed, how can I get the certificate for it?

Murof

Hello aegis

do you have tested also with UAExpert (often this testclient show slightly different errors if something does not work)

bye Murof

 Hi, Murof,

No, I haven't tested UAExpert. Actually to resolve the issue I have downloaded quite a few OPC UA explorer available. But no luck.So, I decided to download another version of OPC Scout 10. Which is as same version as my existinf one but the interface is different. I got it from Simatic Net 16 CD pack.

Surprisingly the certificate issue was resolved. And more interesting is that even you cannot see any variable from the "@LOCALMACHINE", you can monitor the variable if you know their name. For an example I had a simple list of OPC UA data, from there I copied the data name, used server security : none, and sever name.

However, first problem with my server was, I haven't installed all the packages like, OPC Server, Connectivity Pack.

So far things are working. Thanks for your support.

Take care.