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A warning is shown while accessing Plesk or webmail: The certificate is not trusted or NET::ERR_CERT_AUTHORITY_INVALID

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Renan Genova Ferreira
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Applicable to:

  • Plesk for Linux
  • Plesk for Windows

Symptoms

The following error is shown while accessing Plesk or webmail:

  • On Google Chrome:

    CONFIG_TEXT: Your connection is not private
    NET::ERR_CERT_AUTHORITY_INVALID

  • On Firefox:

    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.

  • On Opera

    CONFIG_TEXT: Opera cannot verify the identity of the server "XXXX", due to a certificate problem. The server could be trying to trick you

Cause

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

Resolution

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 a valid certificate.

In order to avoid the warning, it is required to have a valid SSL certificate. There are several options on how to achieve that:

Secure Plesk/domain/WebMail via Let's Encrypt:
Use a purchased SSL 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.

Comments

2 comments

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  • Avatar
    Emre Toraman

    What if I don't want to use a SSL for specific domain?

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  • Avatar
    Alexandr Tumanov

    @Emre, if there is no SSL or if you don't want using it, just use http://hostname:8880 instead of https://hostname:8443

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