A bunch of small questions ..

[joximu]

Well I don't know how your zonefiles look like...
IN A should also work...

ok, did you reload apache after changing the conf files? (just to be sure..)

I'd recommend to use a 3rd level domain for theese customer URLs. Instead of
customerX.mysite.com
rather
customerX.customers.mysite.com

Advantage:
you can add a wildcard in the DNS configuration "*.customers IN A <ip>"
there won't be any colision with a customer named "www" :-)

But first it's important that the changes are recognized by apache in the right way...

Maybe you can show us the output of

Code:

grep -i "virtualhost\|server" /etc/apache2/sites-enabled/ispcp.conf

/J