Originally Posted by singh_chitranjan
i have RHEL4 server. my root is able to login from CUI mode but not able to login from GUI mode. normal user is able to login from GUI mode and we go to root through su command but directly root is not able to login from GUI
Root login in GUI is not a good idea. Its by default disabled in most distros.
To enable it again, edit the file /etc/pam.d/gdm and make the line commented which is given below.
# auth required pam_succeed_if.so user != root quiet