login as root

[karthik_in83]

when you login as root,what are the possible causes to get errors? for ex.nologin file, root is in shutdown.allow like that.......
can anyone give me the answers?

[Court Campbell]

A better description if the error(s) you are seeing would help. For all I know the / file system could be at %100.

[tsf_1]

Yes, avoid root filesystem full to prevent root login failed is important.

Others may be "no shell" if /etc/passwd has invalid shell indicated. Sometimes it can be invalid data in /etc/passwd or /etc/group file, you may check validity of these files with 2 commands below:

#pwck
#grpck

If you see problems here, make the necessary changes.

[karthik_in83]

hi,

I heard this sentence from my friend....

If the /etc/security/passswd/ file's permission is 600,root can login. If it is not,root cannot login.

Is it true? If yes, can anyone explain?

by karthik

[karthik_in83]

can anyone tell me the reasons for root login fail?

[navin]

Karthik,
Why don't you post the error message when you login as root?
Thanks

[karthik_in83]

hi navin,

i had a question in interview like this..

what are the possible cause unable to login a system as root?
can u tell me the possible cause?