I cannot reach the ISPConfig 2 system on port 81

Please check if you have tried to reach the system over the right protocol (https or http). If this is the case please verify that the ISPConfig system started before (with ps aux on the command line, or just restart the ISPConfig system: /etc/rc.d/init.d/ispconfig_server restart (RedHat/Mandrake) respectively /etc/init.d/ispconfig_server restart (SuSE)). If this still does not ... Read more

How will my existing Apache installation be influenced by the installation of ISPConfig 2?

The ISPConfig Apche webserver is installed in parallel with your existing Apache installation. The ISPConfig apache is only used for the controlpanel. The hosted webpages are served by the Apache that ships with your linux distribution. This means you do not have to compile special modules into your Apache in order to work with ISPConfig. ... Read more

Postfix: One of the users on the system has a CatchAll-email address. He receives all emails, even those intended for users of another site on the same server.

Please check if the domain of the users that receives all emails is the same as the domain $mydomain in /etc/postfix/main.cf. If this is the case, change $mydomain and run: postfix reload on the shell. You should never enter a domain that is used for a virtual site on the server as $mydomain in /etc/postfix/main.cf!