Authentication Failed in Linux centos

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Authentication Failed in Linux centos

Hi everyone ...

( Linux Cent OS ) i cant login as root user in my lab machine ... i did give correct root and root passwd ..but it showing Authentication Failed ...

plz help me
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PAM_SECURETTY(8)						 Linux-PAM Manual						  PAM_SECURETTY(8)

NAME
pam_securetty - Limit root login to special devices SYNOPSIS
pam_securetty.so [debug] DESCRIPTION
pam_securetty is a PAM module that allows root logins only if the user is logging in on a "secure" tty, as defined by the listing in /etc/securetty. pam_securetty also checks to make sure that /etc/securetty is a plain file and not world writable. This module has no effect on non-root users and requires that the application fills in the PAM_TTY item correctly. For canonical usage, should be listed as a required authentication method before any sufficient authentication methods. OPTIONS
debug Print debug information. MODULE TYPES PROVIDED
Only the auth module type is provided. RETURN VALUES
PAM_SUCCESS The user is allowed to continue authentication. Either the user is not root, or the root user is trying to log in on an acceptable device. PAM_AUTH_ERR Authentication is rejected. Either root is attempting to log in via an unacceptable device, or the /etc/securetty file is world writable or not a normal file. PAM_INCOMPLETE An application error occurred. pam_securetty was not able to get information it required from the application that called it. PAM_SERVICE_ERR An error occurred while the module was determining the user's name or tty, or the module could not open /etc/securetty. PAM_USER_UNKNOWN The module could not find the user name in the /etc/passwd file to verify whether the user had a UID of 0. Therefore, the results of running this module are ignored. EXAMPLES
auth required pam_securetty.so auth required pam_unix.so SEE ALSO
securetty(5), pam.conf(5), pam.d(5), pam(8) AUTHOR
pam_securetty was written by Elliot Lee <sopwith@cuc.edu>. Linux-PAM Manual 04/01/2010 PAM_SECURETTY(8)

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