Troubleshooting "No valid certification authority found" when making a HTTPS GET request to Insights Hub APIs from a Siemens PLC S7-1200.
Goal: Establishing a HTTPS connection from S7-1200 to Insights Hub by API certificate extracted from web browser, allowing S7-1200 to act like an agent and send data to Insights Hub.
Issue: "No valid certification authority found" when making a HTTPS GET request to Insights Hub APIs.
Possible cause: Company network may be blocking access to the certificate via the PLC generated by Insights Hub. Try changing the PLC's DNS to check (e.g. Google's, DNS).