Add HTTPS to a Domain using LetsEncrypt on Webmin/VirtualMin

• Add a TXT record to your domain – it should have this value: _acme-challenge.DOMAIN.TLD – example: _acme-challenge.binnyva.com. Hostname will be @.
• Do this for all the subdomains you want an SSL certificate for. It will look like this – _acme-challenge.www.binnyva.com, _acme-challenge.txt.binnyva.com. Each subdomain will need a separate TXT record.
• Open VirtualMin, go to the domain’s Virtual Server.
• Go to Server Configuration > SSL Certificate(in the Sidebar)
• Open the Let's Encrypt tab.
• Select the ‘Domain names listed here’ option, and enter all the domains you want an SSL certificate for – separated by new lines.
• Click Request Certificate

If all went well, you’ll get the certificates automatically installed with in a minute or so.

Justed used this to get an certificate for Arathi M D.