How to enable secure TLS versions and ciphers in Plesk for Linux?

Question

• How can I allow only secure TLS versions and ciphers via the Plesk GUI?
• How to enable secure TLS versions and ciphers in Plesk to get a good score in SSL/TLS audits, e.g. SSL Labs?

Answer

As of Plesk Obsidian 18.0.80, TLS versions and ciphers can be managed from the Plesk GUI. It works by applying Mozilla's presets (Modern/Intermediate/Old) across all services and can be configured via the following steps:

1. Log in to Plesk.
2. Open Tools & Settings > TLS versions and ciphers management.
3. Press on Settings.
4. Move the slider to the right in order to enable TLS versions and ciphers by Mozilla
   
5. Select which protocols and ciphers to use:
   
6. (Optional) Press on More details in order to get detailed information related to the TLS versions and ciphers that will be allowed with each selection:
   
7. Press on Enable & Sync
8. Press Save