default vhost
 

I read a lot of post in here about setting the default vhost file of apache but I cannot conclude to anything specific.
So I did this:
I renamed the default file to default.old (in case I need it later) in /etc/apache2/sites-available and I made a symlink of one of my vhost (eg xyz.com.vhost) to default. (ln -s xyz.com.vhost default)

Now I have the default vhost that I want (and not the first available when someone try to access by ip or by unknown subdomain), but I don't know if the above action interfere somehow with ISPConfig.

Does the ISPConfig uses the default vhost (the default file) for some particular reason?

It is used for webmail and phpmyadmin. Changing the default vhost might disable webmail and phpmyadmin and all other webbased software that you might have installed with the package manager of your linux distribution.

Ok. So which is the best way to define the default vhost?
For the record, with the above change, I have no problem with webmail and phpmyadmin. I did the change after I have installed them

I followed your advice and left default untouched.

The trick I did is to make a symbolic link to my desired host:
This vhost comes first and after the 000-default and 000-ispconfig