Background what happened: linux virtual machine in vmware that opens, enter the account number and password can not log in, but with other devices connected to the terminal and can smoothly open.
1, for investigation of the matter, use the command on the terminal, then vmware that landing, view the log
tail -f / var / log / secure
Mar 14 11:05:06 testOpenfire login: PAM unable to dlopen(/lib/security/pam_limits.so): /lib/security/pam_limits.so: cannot open shared object file: No such file or directory
Mar 14 11:05:06 testOpenfire login: PAM adding faulty module: /lib/security/pam_limits.so
Mar 14 11:05:10 testOpenfire login: pam_limits(login:session): unknown limit type 'herd'
Mar 14 11:05:10 testOpenfire login: pam_unix(login:session): session opened for user root by LOGIN(uid=0)
Mar 14 11:05:10 testOpenfire login: Module is unknown
Mar 14 11:05:21 testOpenfire login: PAM unable to dlopen(/lib/security/pam_limits.so): /lib/security/pam_limits.so: cannot open shared object file: No such file or directory
Meaning that PAM unable to dlopen /lib/security/pam_limits.so this document, there is no reason that pam_limits.so view this file to / lib / security / lower case
2, in /etc/pam.d/login, the configuration information which follows 
next is marked on this line to annotate, then reboot the device can be a normal landing