I was trying to run crontab -e command and got this error message:
[git@pandora gitorious]$ crontab -e
cron/git: Permission denied
As the message says: it’s a permission problem. To solve this you’ll have to change /usr/bin/crontab‘s permissions:
# chmod 4755 /usr/bin/crontab
And if that does not solve your problem, check /var/spool/cron/‘s permissions, they should match: drwxr-xr-x (755).