Tag Archives: security

Helpful Tips

Webmin bug copying SSL certificates to Virtualmin panel

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When you generate a SSL certificate for an nginx site through the Virtualmin interface for a virtual (sub-)server, the button “Copy to Webmin” incorrectly triggers the “Copy to Usermin” feature.

On the other hand, the Webmin interface to generate the SSL certificate also fails, because it does not allow for generation for nginx hosts (only Apache hosts).

Trick:

  1. Generate the SSL certificate using Let’s Encrypt in Virtualmin for the virtual (sub-)server.
  2. Run the following command as root to copy the certificate to Webmin:
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    virtualmin install-service-cert --domain yourdomain.com --service webmin
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Helpful Tips

Add Lets Encrypt for Webmin/Virtualmin Panel itself

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Are you getting a “challenge did not pass” error? Can’t find a matching hostname for your Webmin panel to generate Let’s Encrypt certificates to?

The trick is that Lets Encrypt only works with Apache. Most Webmin/Virtualmin panels are running on miniserv Perl scripts on port 10000. We must follow the following steps:

1. Create a virtual server (or sub server) for the matching domain in Virtualmin.
2. Go to Webmin > Webmin Configuration > SSL Encryption > Let’s Encrypt
3. Request Certificate for “Apache virtual host matching hostname”. Set renewal for 12 months!