Unable to install certificate for domain in Plesk: SSL/TLS Certificates option is missing

Symptoms

• SNI support is disabled:

  # grep SNI_SUPPORT /etc/psa/psa.conf
  SNI_SUPPORT false

• Website is hosted on shared IP address.
• SSL support is enabled for website, but SSL Cerificates option is missing under Domains > example.com > Hosting Settings. 

Cause

SNI support is not enabled.

Resolution

Note: if you don't have administrative access to Plesk via SSH, contact your hosting provider regarding the issue

1. Connect to the server using SSH.

2. Edit /etc/psa/psa.conf file and change SNI_SUPPORT value to true:

   CONFIG_TEXT: SNI_SUPPORT true

3. Restart psa service:

   # service psa restart

4. Log into Plesk.

5. Reload server components under Tools & Settings > Server Components > Refresh.