Article ID: 124107, created on Dec 30, 2014, last review on Aug 17, 2016

  • Applies to:
  • Plesk


Why the following message is thrown while accessing Plesk?

  • In Chrome:

    Your connection is not private
  • In Firefox:

    This Connection is Untrusted
    (Error code: sec_error_unknown_issuer)
  • In Internet Explorer:

    There is a problem with this website’s security certificate.


By default, Plesk is using self-signed certificate that does not have a signature from trust center.


After adding the IP address/hostname/domain to exception for web browser, message will not be shown again for this IP address/hostname/domain.

To use Plesk over HTTPS protocol without this message a valid SSL certificate signed for IP address/hostname/domain by trust center is required. See Administrator's Guide - Getting SSL Certificates for details.

To add a purchased SSL certificate to Plesk, follow this path:

Plesk > Tools & Settings > SSL Certificates > Secure Plesk

Also, Plesk can be accessed via HTTP protocol, for example:

Search Words


The certificate is not trusted

self-signed certificate

Your connection is not private


accessing Plesk error

uses an invalid security certificate

SSL certificate

There is a problem with this website’s security certificate

(Error code: sec_error_unknown_issuer)


This Connection is Untrusted

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