Apache permission denied

Apache newbie question here:

I’ve installed rt on debian using the
debian package request-tracker3,
everything works fine on the host box,
however every time I try to log in from a remote box
I get permission denied. I know it must be something in the apache - rt
setup. My WebPath is setup as “”, WebBaseURL = http://RT:localhost

Is there something wrong with the above? I’ve read about the www-data user -
Am I supposed to add this ? - the debian package install makes no mention of