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How to install Let's Encrypt SSL certificate
Make sure your site is available in all its aliases, e.g: www.yourdomain.tld
All DNS A / AAAA records of the site and aliases must point to the server.
Then inside ISPConfig web hosting control panel perform these tasks:
Go to Sites module
Click on the site you want the certificate
Check the Let's Encrypt SSL field
Click on Save button
You can test cypher strength and quality using
SSL Server Test
You may consider to add a DNS CAA record.