X64Linux cannot log on to the local character interface

X64Linux cannot log on to the local character interface to solve common exceptions. In other words, I have a server in charge of squid. it's always up to her to log on remotely. Today, I want to change a gateway, so I took a monitor and operated it locally. When the user name root password *... information & X64 Linux cannot be logged in from the local character interface, there are often some strange things. In other words, I have a server in charge of squid. it's always up to her to log on remotely. Today, I want to change a gateway, so I took a monitor and operated it locally. After entering the username and root password *, press enter and let me lose again ?? Okay, I lost again. it's still like this! The account authentication interface cannot be logged on. Why is the server hacked ?? Login with a notebook is normal. View Server security logs: tail-50/var/log/secure: May 2 18:45:41 server1 login: PAM unable to dlopen (/lib/security/pam_limits.so) may 2 18:45:41 server1 login: PAM [error:/lib/security/pam_limits.so: wrong ELF class: ELFCLASS32] May 2 18:45:41 server1 login: PAM adding faulty module: /lib/security/pam_limits.so May 2 18:45:45 server1 login: pam_unix (login: auth): authentication failure; logname = LOGIN ui D = 0 euid = 0 tty = tty1 ruser = rhost = user = root May 2 18:45:46 server1 login: failed login 1 FROM (null) FOR root, Authentication failure May 2 18:46:05 server1 login: failed login 2 FROM (null) FOR root, Authentication failure May 2 18:46:15 server1 login: pam_unix (login: session): session opened for user root by LOGIN (uid = 0) may 2 18:46:15 server1 login: Module is unknown because the operating system is before RedHat As5.3 X64 Experience implies that this may be related to the storage path of X64 files. Edit the login configuration file vim/etc/pam. d/login: change the last session required/lib/security/pam_limits.so to session required/lib64/security/pam_limits.so and save and exit. Try logging on locally! No error is reported in the log.