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ببنید
On a CentOS system I was tweaking the /etc/security/access.conf file and as this required that I also loaded the pam_access.so module by declaring it in /etc/pam.sshd.
Doing this caused crond to stop working... (the message of this post).
The solution was to uncomment the following line (in /etc/security/access.conf):
+ : root : cron crond :0 tty1 tty2 tty3 tty4 tty5 tty6
This will allow root user to use its crontab file.
See http://spectlog.com/content/Login_ac..._access_module