I suppose you have already installed ISPC and want it on port 80 and not 81 as per default? Correct? Change this in /ispconfig/httpd/conf/httpd.conf. Change the line <VirtualHost _default_:81> to <VirtualHost _default_:80> and restart ISPC. //Erk
You must also change the Listen directive in /root/ispconfig/httpd/conf/httpd.conf, like Code: Listen 1.2.3.4:80 Also change the port number in /home/admispconfig/ispconfig/lib/config.inc.php. Then you must configure your main Apache to listen on another IP address than the ISPConfig Apache. Afterwards restart ISPConfig and your main Apache.