Hi, I am working on a new server with a clean install of Ubuntu 18.04 LTS and I have followed the tutorial: The Perfect Server - Ubuntu 18.04 (Bionic Beaver) with Apache, PHP, MySQL, PureFTPD, BIND, Postfix, Dovecot and ISPConfig 3.1 I selected the option to "... secure (SSL) connection to the ISPConfig web interface" and the certificates were successfully generated. I can access ISPConfig successfully but I get the SSL error message that "The certificate is not trusted because it is self-signed". Why is this? I can view the certificate from the browser and it looks fine. Any suggestions please? Thanks, Cliff
The reason is that the SSL cert is a so-called self-signed SSL certificate which means that you are the issuer of that certificate and as your browser does not know you, it shows a warning that it does not trust the certificate. You can replace it with a certificate from let's encrypt to get rid of the browser warning. https://github.com/ahrasis/LE4ISPC
