Well I can't see any apache listening on Port 81.
There is an http on 80 and 443 but that's the one for your website, not the one ISPConfig is using.
Try /etc/init.d/ispconfig_server start
Because if I make a netstat -tap then there is sth like
Quote:
|
tcp 0 0 *:81 *:* LISTEN 1450/ispconfig_http
|