Note: Before securing a domain with a Let's Encrypt certificate, make sure the domain name is resolved to a public IP address of the Plesk server from the Internet.
To install a free Let's Encrypt SSL/TLS certificate for a domain alias in Plesk, navigate to your main domain's Websites & Domains page and select Let's Encrypt, then check the boxes for your specific domain aliases before clicking Install.
Steps to Install SSL for a Domain Alias
- Log into your Plesk control panel.
- Go to Websites & Domains and locate your main domain.
- Click on Let's Encrypt
- Enter a valid Email address for urgent notifications.
- Under the options, look for the list of domain aliases tied to your subscription.
- Select the checkboxes next to the aliases you want to protect with this certificate.
- Click Install or Get it free to generate and apply the Subject Alternative Name (SAN) certificate covering your main domain and selected aliases.
