User authentication

Hi all,

I've just installed RT 3.0.0  in a Red Hat 8 linuxbox. I've tested 

with Apache 2 and Apache 1.3.27 and with both versions I have the same
problem: when I enter username and password the system says : “Your
username or password is incorrect”. I have tested with the default
configuration and users RT_System, Nobody (no password) and root.

Any ideas?