OPC UA Client Certificate - Industrial Communication Toolbox using old certificate

Dear MathWorks community,

recently my Windows PC's "Computer Name" had to be changed. Since then I can no longer connect to OPC UA servers using the Industrial Communication Toolbox. I suspect this is due to the client certificate (which contains the computer name) not being updated automatically. The error I'm getting is:

Error using opc.ua.Client/connect

The URI specified in the ApplicationDescription does not match the URI in the Certificate.

I tried uninstalling and reinstalling the toolbox as well as completely uninstalling Matlab and deleting related files (e.g. C:\Users\user\AppData\Roaming amongst others) to no avail.

Following screenshot from the Prosys Simulation Server shows the certificate being used by Matlab. It uses an old certificate, even though I reinstalled Matlab and the Industrial Communication Toolbox from scratch.

Is there a way to update the client certificate or at least delete it so that a new installation would create a new/correct version?

Many thanks in advance for a reply and best regards,

Imanuel

Answer 1

[Imanuel Heider]

I found the answer myself. Do the following if you have the same problem:

1) Find the direcotry where the certificate is stored on your machine:

certStore = fullfile(getenv('ProgramData'),"MathWorks","OpcUaCertStore");

2) Go to the certStore directory and delete the folder 'OpcUaCertStore' to get rid of the old certificate.

3) Next time you connect to an OPC UA server, a new client certificate will be generated automatically.

uaClient = opcua(uaEndpoint);
connect(uaClient);

Best regards,

Imanuel