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_WHEEL(8)							 Linux-PAM Manual						      PAM_WHEEL(8)

NAME
pam_wheel - Only permit root access to members of group wheel SYNOPSIS
pam_wheel.so [debug] [deny] [group=name] [root_only] [trust] DESCRIPTION
The pam_wheel PAM module is used to enforce the so-called wheel group. By default it permits root access to the system if the applicant user is a member of the wheel group. If no group with this name exist, the module is using the group with the group-ID 0. OPTIONS
debug Print debug information. deny Reverse the sense of the auth operation: if the user is trying to get UID 0 access and is a member of the wheel group (or the group of the group option), deny access. Conversely, if the user is not in the group, return PAM_IGNORE (unless trust was also specified, in which case we return PAM_SUCCESS). group=name Instead of checking the wheel or GID 0 groups, use the name group to perform the authentication. root_only The check for wheel membership is done only. trust The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the user is a member of the wheel group (thus with a little play stacking the modules the wheel members may be able to su to root without being prompted for a passwd). MODULE TYPES PROVIDED
The auth and account module types are provided. RETURN VALUES
PAM_AUTH_ERR Authentication failure. PAM_BUF_ERR Memory buffer error. PAM_IGNORE The return value should be ignored by PAM dispatch. PAM_PERM_DENY Permission denied. PAM_SERVICE_ERR Cannot determine the user name. PAM_SUCCESS Success. PAM_USER_UNKNOWN User not known. EXAMPLES
The root account gains access by default (rootok), only wheel members can become root (wheel) but Unix authenticate non-root applicants. su auth sufficient pam_rootok.so su auth required pam_wheel.so su auth required pam_unix.so SEE ALSO
pam.conf(5), pam.d(5), pam(7) AUTHOR
pam_wheel was written by Cristian Gafton <gafton@redhat.com>. Linux-PAM Manual 05/31/2011 PAM_WHEEL(8)

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