- Plesk Onyx for Linux
- Website preview is unable to load some CSS files.
- There are warnings regarding mixed content in Browser Console.
- Preview link is opened via HTTPS.
- There is a default site for the corresponding IP address set in Tools & Settings > IP Addresses > 203.0.113.2.
- Default site has redirection from HTTP to HTTPS enabled.
Plesk bug #PPPM-8687 that is planned to be fixed in one of the future product updates.
Until a fix is available, select another type of preview in Tools & Settings > Preview Settings or do not use the default site with HTTP to HTTPS redirection.