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Server Security Tips

1. Do not allow direct root/administrator login
2. Make sure passwords are secure and changed regularly (by force if necessary)
3. Use a network firewall, such as APF
4. Use an application firewall, such as ModSecurity
5. Chroot all non-root users to keep them out of system directories
6. Use virus scanners and spam filters
7. Close mail server open relays
8. Keep all software and scripts up-to-date
9. Test your server for security holes
10. Keep up on the latest security news
11. Use SSL for secure data transactions
12. Set permissions as strictly as possible on any web-accessible files

Image Source: Wikimedia Commons

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