Thank you for your answer.

Can you be a bit more precise? In case the cert is not valid for this connection, how would you retrieve a valid cert from this server: https://www.vision11.ch

I am using this service: https://projects.petrucci.ch/esp32/?page=ssl

Thanks in advance for help.

Lukas

Hello ESP32 Community I am trying to run the HTTPS OTA Demo. https://github.com/espressif/arduino-esp32/blob/master/libraries/Update/examples/HTTPS_OTA_Update/HTTPS_OTA_Update.ino I just added my WiFi Credentials, URL and Certificate (I am using the certificate in another sketch, so it should work)....