[root@localhost]# cat /var/log/cron|grep '(user)'|grep ERROR|grep 'Aug 3 19' Aug 3 19:00:01 localhost crond[12064]: CRON ( user ) ERROR: failed to open PAM security session: Success Aug 3 19:00:01 localhost crond[12064]: CRON ( user ) ERROR: cannot set security context Aug 3 19:01:01 localhost crond[23108]: CRON ( user ) ERROR: failed to open PAM security session: Success Aug 3 19:01:01 localhost crond[23108]: CRON ( user ) ERROR: cannot set security context 通过错误日志 ,查看/etc/pam.d/crond 把所有required改成sufficient就可以了,但具体原因不明。。。。 [root@ localhost]# cat /etc/pam.d/crond # # The PAM configuration file for the cron daemon # # #auth sufficient pam_rootok.so #auth required pam_env.so #auth include system-auth #account required pam_access.so #account include system-auth #session required pam_loginuid.so #session include system-auth auth sufficient pam_rootok.so auth sufficient pam_env.so auth include system-auth account sufficient pam_access.so account include system-auth session sufficient pam_loginuid.so session include system-auth You have new mail in /var/spool/mail/root