Is it possible to turn off this? I would like to get to phpmyadmin and ISPConfig only accross 188.8.131.52/phpmyadmin or :8080 and not while i m using my domain name.
The ispconfig vhost is port based, so you can reach ispconfig on port 8080, the domain or IP does not matter. If you want to change that, you will have to edit the ispconfig vhost in /etc/apache2/sites-available/ and then restart apache.
phpmyadmin is a apache alias, so you can reach it on any vhost. If you like to change that, edit the phpmyadmin config file in /etc/apache2/conf.d/