Related to root login

[Swapana Ghosh]

Hi 

       One of our server(redhad 7.1) we login as 

      telnet domain.com
      user : admin
      pass : -
    
      su - root
      root passwd

but today i found something has been changed i can't
able 
to enter to root as su - root

      i am entering as sudo bash
      then again giving the admin passwd ...

the /etc/pam.d/su file is as follows:

#%PAM-1.0
auth       sufficient   /lib/security/pam_rootok.so
# Uncomment the following line to implicitly trust
users in the "wheel" group.
#auth       sufficient   /lib/security/pam_wheel.so
trust use_uid
# Uncomment the following line to require a user to be
in the "wheel" group.
#auth       required     /lib/security/pam_wheel.so
use_uid
auth       required     /lib/security/pam_stack.so
service=system-auth
account    required     /lib/security/pam_stack.so
service=system-auth
password   required     /lib/security/pam_stack.so
service=system-auth
session    required     /lib/security/pam_stack.so
service=system-auth
session    optional     /lib/security/pam_xauth.so
~

Where is the changes done .....
How can i go back to my original state....

Thanks in advance
-Swapna

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