Issue with FQDN certificate for ISPConfig 3 control panel - NET::ERR_CERT_COMMON_NAME_INVALID

Discussion in 'Installation/Configuration' started by ConRaul, Dec 3, 2023.

  1. ConRaul

    ConRaul New Member

    Hi guys!
    I just installed ISPConfig on a virtual server as per the Perfect Server Debian 12 + ISPConfig guide.
    Everything works perfect (webmail, https redirect, DNS is properly configured, server can be reached with FQDN), except the ISPConfig control panel.
    I permanently receive a warning message "Privacy Error: NET::ERR_CERT_COMMON_NAME_INVALID".
    Looking into the certificate details it looks OK to me.
    I tried (I believe) every suggestion related this matter, even reconfiguring and updating ISPConfig, but haven't succeeded.
    Any suggestion would be welcomed.

  2. till

    till Super Moderator Staff Member ISPConfig Developer

    The ssl cert is issued for the systems hostname, you can see that hostname by running this command on the shell of your server:

    hostname -f

    and you must use this hostname to connect via your browser. Example:


    where hostname is the exact name the above command returned.
  3. ConRaul

    ConRaul New Member

    Thank you very much, it works! Much appreciated. Never thought about this...

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