原因云锁开启“登录防护”功能后会修改PAM认证模块/etc/pam.d/sshd中配置，生成/etc/pam.d/password-auth-ys，卸载后PAM相关配置没还原成功。
[root@ebs-71258 ~]# cat /etc/pam.d/sshd #%PAM-1.0 auth required pam_sepermit.so auth include password-auth account required pam_nologin.so account include password-auth password include password-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open env_params session optional pam_keyinit.so force revoke session include password-auth [root@ebs-71258 pam.d]# ll sshd password-auth* lrwxrwxrwx. 1 root root 16 Jun 8 2013 password-auth -> password-auth-ac -rw-r--r--. 1 root root 896 Jun 8 2013 password-auth-ac -rw-r--r--. 1 root root 1007 May 8 15:31 password-auth-ys -rw-r--r--. 1 root root 578 May 8 15:31 sshd [root@ebs-71258 pam.d]# cat /etc/pam.d/sshd #%PAM-1.0 auth required pam_sepermit.so auth include password-auth-ys account required pam_nologin.so account include password-auth password include password-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open env_params session optional pam_keyinit.so force revoke session include password-auth
