I have a working installation of Webmin with plenty of working sites on https already. I'm using cerbot / letsencrypt to create certificates and it seems to work just fine.
My issue now is that webmin is being accessed on https://example.com:1000 and it works, but the browser doesn't support the certificate as "valid" - it says "not secure" and the https has a strike-through line over it and it's marked red.
Why would that be? Do I have to use a proxy for 10000 port somehow to match it with 443? If I access just https://example.com it works (but something else resides here, not Webmin).
So how would I go about making SSL certificate work on a 10000 port ?
All info appreciated.