What is crontab correct permission?

The crontab correct permission is 4755 and you can check the crontab binary path and set the correct permission by using the following command from the shell.

Login in server as root user.

root@admin#[~] # which crontab

/usr/bin/crontab

chmod 4755 /usr/bin/crontab

Many time the wrong crontab permission causes the problem while saving a cronjob from the cPanel.