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I'm getting this message in my /var/log/cron

Mar 12 09:20:01 server2 crond[1267]: (*system*) BAD FILE MODE (/etc/cron.d/vnstat)

How do I fix this problem under Fedora / CentO / RHEL or any Linux distro?
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Linux / UNIX Crontab File Location

I login to my UNIX system as a normal user. However, I need to update my cronjob entry. But, I can't find where the crontab file is. How do I find out my crontab file location?
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Q. How do I capture specific protocol or port such as 80 ( http ) using TCPDump tool under Linux / UNIX? How do I recording Traffic with TCPDump and find problems later on?
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Test Iptables Script Remotely

How do I test iptables based script remotely over ssh session? How do I avoid lock outs?
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