Debian 11 php7.4 ispconfig 3 All my sites of my server is OK. I would like to change my hostname because the hostame is not a website. I read this to change: Code: Change the hostname in /etc/hosts /etc/hostname /etc/mailname /etc/postfix/main.cf and then reboot the server. Is there a change on virtualhost of my website. Don't forget to change the DNS PTR Record of your IP as well: how to make that?