A website hosted in Plesk redirects to the Plesk login page when accessed via HTTPS by URL https://example.com.
Website is opened correctly via HTTP by URL http://example.com
At Plesk > Tools & Settings > Customize Plesk URL is set to All domains and subdomains that resolve to the server IP address but are not used for hosting
Missing bindings in IIS server or the website has SSL/TLS Support disabled.
Apply one of the following solutions:
Enable SSL/TLS support for the domain:
Disable Custom Plesk URL:
Go to Tools & Settings > Customize Plesk URL;
Set No custom URLs. Only https://<server-IP-or-hostname>:8443;
Warning: After this change, Plesk will be accessible only on port 8443: https://<server-IP-or-hostname>:8443