- Plesk Onyx for Linux
An SSL certificate newly assigned in Domains > example.com > Hosting settings is not used by website.
Apache graceful restart is configured causing delayed Apache reconfiguration.
Reduce the Apache restart interval in Tools & Settings > Apache web server.
Or login to Plesk server via SSH and regenerate website configuration:
# /usr/local/psa/admin/sbin/httpdmng --reconfigure-domain example.com