Symptom :
On a new installation of Fedora 13 it is impossible to login as root via GUI
The reason is security .
You can always login as a user and then su to root .
Solution :
In case you have to have this feature do the following :
Configure the pam authentication files gdm and gdm-password .
Edit "/etc/pam.d/gdm" file (preferably with the vi editor) .
find the line :
auth required pam_succeed_if.so user != root quiet
comment out the line with a "#" in front of it
Example :
#auth required pam_succeed_if.so user != root quiet
Save and Close the file .
Now editthye file "/etc/pam.d/gdm.password" (preferably with the vi editor) .
find the line :
auth required pam_succeed_if.so user != root quiet
comment out the line with a "#" in front of it
Example :
#auth required pam_succeed_if.so user != root quiet
Save and Close the file .
Logout user and login with root .