When opening Plesk URL using an IP address (e.g. https://203.0.113.2:8443), Plesk login page shows the following message:
To avoid SSL warnings during Plesk login, use https://example.com:8443
When Plesk login page is opened using an IP address, Plesk offers a redirect to a secured domain name. The domain name is taken from an SSL certificate used to secure Plesk URL at Tools & Settings > SSL/TLS Certificates > Certificate for securing Plesk.
Apply one of the following solutions:
Solution I: Change the domain name
To change the domain name mentioned in the message, secure Plesk URL with an SSL certificate for a domain name using the instructions from this KB article.
Solution II: Disable the message about SSL warning
Install the Panel.ini Editor extension for Plesk.
Open the extension and switch to the Editor tab.
Add the following lines:
showSSLwarnings = 0
Save the changes.