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Webmail page throws a security warning: SSL_ERROR_BAD_CERT_DOMAIN

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Mikhail Shport
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Plesk for Windows Plesk for Linux kb: technical ext: le ABT: Group B

Applicable to:

  • Plesk for Linux
  • Plesk for Windows

Symptom

  • Webmail is secured with an SSL certificate using the following KB article:
    How to secure the webmail with a Let's Encrypt certificate in Plesk

  • Accessing webmail page in a browser throws security warning:

    CONFIG_TEXT: The certificate is only valid for the following names: www.example.com, example.com
    Error code: SSL_ERROR_BAD_CERT_DOMAIN

Cause

The certificate was not issued to CN (Common Name) webmail.example.com.

Resolution

  1. Log into Plesk

  2. Go to Domains > example.com > SSL/TLS Certificates

  3. Issue a new certificate that will be valid for webmail.example.com CN as well.

    Note: Tick the "Secure webmail on this domain" checkbox on issuing via Let's Encrypt

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