Applicable to:
- Plesk for Linux
- Plesk for Windows
Symptoms
It is not possible to access the Plesk Installer page over 8447 port from an iOS or macOS device with the following certificate warning message, whereas Plesk panel is secured with a valid SSL certificate and it is possible to access it via 8443:
Your connection is not private
NET::ERR_CERT_COMMON_NAME_INVALID
Cause
Certificate chain error after the Let's Encrypt's root certificate update - the installer page is served with an outdated certificate.
This behavior is designated as a bug with ID PI-729 and is planned to be fixed in upcoming Plesk updates.
Resolution
Until the bug is fixed, ignore the certificate warning and proceed to the Plesk Installer page via HTTP.
As an alternative, Plesk Installer menu can be accessed via command-line interface using plesk installer command.
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