- Plesk Onyx for Linux
- Plesk Onyx for Windows
The following message is thrown while accessing Plesk or webmail:
On Google Chrome:
CONFIG_TEXT: Your connection is not private
CONFIG_TEXT: This Connection is Untrusted
(Error code: sec_error_unknown_issuer)
Certificate Error: The security certificate presented by this website was issued for a different website's address. This problem might indicate an attempt to fool you or intercept any data you send to the server.
On Internet Explorer:
CONFIG_TEXT: There is a problem with this website’s security certificate.
CONFIG_TEXT: Opera cannot verify the identity of the server "XXXX", due to a certificate problem. The server could be trying to trick you
By default, Plesk is using self-signed certificate that does not have a signature from trust center.
Or, the mismatched certificate was applied.
Note: If Plesk/WebMail is secured via Let's Encrypt, use hostname/domain name to access it because IP address itself cannot be secured with valid certificate.
In order to avoid the warning, it is required to have valid SSL certificate. There are several options on how to achieve that:
- For domain/webmail/alias, it is required to go to Websites and Domains > example.com > Let's Encrypt and proceed with installation. Details are available in the following article:
How to install SSL certificate for a domain in Plesk
- For securing Plesk/Mail Server, go to Tools & Settings > SSL/TLS certificates and proceed from there. See the details in the following articles:
How to secure Plesk login page URL with SSL certificate
How to secure mail server with Let's Encrypt certificate?
Purchase an SSL certificate signed for IP address/hostname/domain by a trusted center (Certificate Authority) or install Let's Encrypt extension and obtain a free certificate. See Administrator's Guide - Getting SSL Certificates for details.