I am the system administrator.I had logged out from my suse linux system on Saturday and now on today when i am trying to login through root i am not able to do so.It is giving me the line like:-
linux-9yl5 login:
and then when i am typing root there it is giving login incorrect....

It is not even asking for root password which i remember very well.Is there any solution for this problem. Please help me and thank you in advance.

If you use sudo you can do

And put in a new password.

AutoBot: SuSE configures sudo by default that you need to use the root password.

Do you use /etc/passwd & /etc/shadow for authentication, or NIS or LDAP or AD?
Is it only root that can't log in or is every user effected?
Do you have ssh configured? Can you log in remotely?

Can you log into the first virtual terminal (vt/0)? Press [CTRL][ALT][F1] and try logging in. It is possible that root logins are restricted to certain terminals. (configured in /etc/securetty)

Did you change the locale (e.g. LC_ALL) of the system so that the character codes for the keys you press are different now?

If you have physical access, you may need to boot up with a live CD or the rescue mode to fix it. First try booting into single mode by entering "S" as a boot option. You will be asked for the root password, but maybe it will be accepted, depending on what the problem is.

I don't know which SuSE version you have. Once I accidentally didn't give a root password during and there was a problem with a hard drive. I had to boot up with a live CD, mount the lvm volumes and copy my regular password hash (in /etc/shadow) to root's so I could log in. Zeroing the root password would not work.

It is possible that you have a problem with the root partition. The system can't log you in if it can't read /etc/shadow.

Yes I'm not up on Suse, sorry for the bad information.

What happens when you try to launch an application that requires root privileges?

I am able to login through other users and also i can act as a root user by giving su root command and then giving the root password so that means root password is correct and not changed.When i am trying by root it is not even accepting the user login name that is root and giving me error "login incorrect".I have tried it on all terminals.Before logging out last time i have just installed CVS(Version Control System) and created a cvs user with password.

Log in as a regular user in one virtual terminal. Run "sudo tail -f /var/log/messages" or which log file your system logs failed login attempts.

Then switch to another virtual terminal and try to log in as root. You probably need to get the answer from the log as you make an attempt.

My guess is either "/etc/securetty" or one of the PAM files in /etc/pam.d/ is where the problem is.