Here you have how to configure letsencrypt: OpenVidu Docs
It is better to deploy using official deployment instructions, not using the .jar directly.
Additional note: By accessing your deployment to your public IP, no certificate will be valid. You need to register a domain name to your public IP and access it through it.
Thank you.
I solved the ssl problem by purchasing the domain. However, I found a problem where the other person’s screen was not visible. Is it a problem with the kms?
Anyways did you opened all ports specified in the documentation?: OpenVidu Docs
EDIT: Also in the capture you’ve sent of your test in the “demo page”, the error is pretty clear: DEVICE_ALREADY_IN_USE. Check that you’re camera is not being accesed by other browsers.