Symptoms
Unable to manage the Security settings available at Hosting Settings in Plesk Onyx:
SSL/TLS Support
Permanent SEO-safe 301 redirect from HTTP to HTTPS
Cause
The permission Hosting settings management is disabled in the respective Service Plan.
Resolution
In Plesk Onyx it's required to enable Hosting settings management permission to manage SSL/TLS Support and Permanent SEO-safe 301 redirect from HTTP to HTTPS:
Click on a section to expand
For Customer or Reseller
Depending on the subscription status:
Subscription is synchronized: Service Plans > Service Plan Name > Permissions > Enable Hosting settings management option > Click Update & Sync
Subscription is locked/customized: Subscriptions > example.com > Customize > Permissions > Enable Hosting settings management option > Click Update & Lock
For Plesk Administrator with Custom View enabled
Go to Tools & Settings > Custom View Settings > Hosting Tools > Enable Hosting settings management option > Click OK to save the changes