i gave it another shot with the following settings:
Domain is: support.example.com
Mailserver is: mail.example.com
hostname is: support.example.com
hosts is: <ipadress> support.example.com example.com
webpath is: /rt
Given that, i set up a new Debian Squeeze Server, installed Apache2, MySQL and Postfix.
Configure Mysql with a password and Postfix with mailserverdomain, Internetsite and confirm any other given question with the preferences shown.
apt-get install rt4-db-mysql
apt-get install rt4-apache2
apt-get install request-tracker4
But beware: the last command will tell you , that there are some packages needed, with newer version than squeeze can provide. So DO NOT ENTER YES, but enter no.
Next you will see a List of 20 or more packages. Enter y(es) here, and it will install without any problem each and every package for Request Tracker.
Checkout, which configuration in /etc/request-tracker4 fits your needs. I was opting for ModPerl2, so mine was apache2-modperl2.conf, which i copied to /etc/apache2/sites-available.
Then i changed into /etc/apache2/sites-enabled and did a