OPC UA Connection Faulted After Upgrade

[pturmel]

Your screenshot says v8.0.12. Which is ancient and unsupported. You are missing relevant features from the v8.1.x series. For now, look at this topic and recommendations:

Ignition OPC UA loopback connection - can it expire?

So, there already was a mention of this expiration in the docs, and they've now added an explicit mention that even the loopback connection will stop working if the certificates expire or are otherwise invalid. OPC UA Security - Ignition User Manual 8.1 - Ignition Documentation (inductiveautomation.com)