[CentOS] CentOS 4.5 (RHEL 4.5) - x86_64 - Login issue

Hi

Strange problem here i think but - I can ssh in to the box fine as root and other users eg oracle

BUT i am trying to login to the console to install oracle using X but i cant and i see this in the logs

hostname su(pam_unix)[20237]: session closed for user oracle

and also

hostname login[19841]: Module is unknown

so the pwd is not accepted and the connection on the console terminated straight away.

I have added this to my pam.d login file

session required /lib/security/pam_limits.so

So i presume this is what is causing the issue but does anyone know which module may be missing?

# rpm -qa | grep pam pam_ccreds-3-3.rhel4.2 pam-0.77-66.21 pam_krb5-2.1.8-1 pam_smb-1.1.7-5 pam_passwdqc-0.7.5-2

thanks