That is true. The installer shows the password. If you have the session still available, scroll back history to see the password.
For future reference Configuring Fail2ban Configuring Apps vhost Installing ISPConfig ISPConfig Port [8080]: Admin password [xxxxxxx]: ( you can hit "enter" or change the password ) Do you want a secure (SSL) connection to the ISPConfig web interface (y,n) [y]: Generating RSA private key, 4096 bit long modulus ...........................................................................++ .................++ e is 65537 (0x010001) You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank