Hi, Sorry for the late reply. I didn't get a notification that someone had replied. After some more trial and error, we managed to generate a valid certificate that the CtrlX OPC UA server accepts. What we did was generate it using OpenSSL, then just configure out client with the certificate and connect to the server. This caused the server to automatically reject the certificate, and we were able to go into the certificates in the PLC and mark it as trusted. Then everything worked. We use version 1.20.1. I am attaching a generated certificate so you can look at it. We don't know if it has additional fields/privileges missing or that don't need to be there. Regards
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