SOLVED: No access to synology nas remotely

[vince]

It would require you provide a certificate.  You cannot enable https and use that port without a cert.

However, we recommend using a proper http server, like apache, nginx, or caddy, to handle https connections.  They are more secure and there are apps that integrate with those apps to automate getting legitimate certificates.

https://jellyfin.org/docs/general/networking/nginx/
https://jellyfin.org/docs/general/networking/apache/
https://jellyfin.org/docs/general/networking/caddy/

Ok that's fine. Thank you very much.