How do I create a SSL cert running on usermin (port 20000)

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My domain is:

My web server is (include version):
The operating system my web server runs on is (include version):
Ubuntu 21.10 (impish)
My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
certbot 1.12.0

I am looking for a way to secure this:

My brave browser will only connect to the site if I use an incognito window.

That website doesn't answer to me.

Anyhow. Once you have a certificate for a domain name, you can use it on each and every port you want.

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...and assuming that usermin is part of Webmin (as Google seems to think it is), the Webmin docs would appear to answer the question.


I revoked the certificate.

I recreated it for use in my apache config file.

I tested it with ssl labs and it says it is not trusted for providing another certificate ( which is another domain I own. Why is it always generating a second cert within

Your website is working fine...

You don't need two certificates for two ports. You can use the same one.

got it working. I found a bug in webmin.

I had to recreate the letsencrypt certificate using the webmin certbot plugin. I then told webmin to copy the cert to the usermin config file.

I recreated the cert for the other domain Webmin copied that cert, key and ca into it's own config file, overwriting the proper one. I'll be contacting the author of webmin.

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