If you are receiving the error /usr/bin/crontab permissions are wrong. Please set to 4755 when in the cron section of cPanel, the commands below may correct the error for Redhat/CentOS/Fedora servers.
Log into the server via SSH or the console as root and run:
yum -y install vixie-cron crontabs
chmod 4755 /usr/bin/crontab
That's it. See how easy it is to fix permission errors in your crontab. Feel free to leave me a re...
By tasia, January 24, 2015