Login to ispconfig and click on the “system” tab.
On the left hand menu click on “server config”, and then click on your server.
Go to the “Web” tab and scroll towards the bottom, you will see the “apps vhost” section.
Apps-vhost should be enabled
Apps-vhost port: you will need to add the following text, replacing the previous entry of just 8081
8081 ssl; ssl_certificate /usr/local/ispconfig/interface/ssl/ispserver.crt; ssl_certificate_key /usr/local/ispconfig/interface/ssl/ispserver.key
So, the new line will read
Apps-vhost port: 8081 ssl; ssl_certificate /usr/local/ispconfig/interface/ssl/ispserver.crt; ssl_certificate_key /usr/local/ispconfig/interface
Apps-vhost IP: _default_
Apps-vhost Domain: Put your servers domain name here
Click save, retry to load phpmyadmin and you should be all set and working with https