- Plesk for Linux
"Keep websites secured" option is not enabled by default at Domains > example.com > SSL/TLS Certificates when SSL It! extension is installed.
A subscription becomes locked after enabling the option Keep websites secured in domain's SSL/TLS Certificate settings.
The option Keep websites secured with free SSL/TLS certificates is not enabled in subscription settings.
The option is not enabled by default because allowing to secure websites with free certificates may not comply with service provider needs.