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  1. Several good free tools for security testing
  2. SSL Certificates and How it works
  3. Too many pageviews from same IP, in less time (analytics report)
  4. suexec vs suphp vs phpsuexec
  5. Difference Between Server & Security?
  6. How to Change the vsftp or vsftpd server banner message
  7. Securing MySQL server
  8. How Do I Block an IP Address on My Linux server?
  9. How do I Telnet as the Root User?
  10. Restrict ssh access using Iptable
  11. Restrict ssh access using tcpd (TCPWrapper)
  12. How Linux file permissions work
  13. Linux script to prompt for password
  14. Where are the passwords of the users located in Linux?
  15. Linux: Delete user password
  16. Howto: Changing Linux Login Shell
  17. Can I set the permissions on a symbolic link under Linux/UNIX?
  18. Linux Login as Superuser ( root user )
  19. Server uptime command to find out how long the system has been running
  20. FreeBSD locking an account
  21. How can I find out who is logged on my UNIX / Linux system?
  22. How do I find out what network services are running or listing under Linux?
  23. Howto: Prevent root user from being able to log in via SSH service
  24. What is a rootkits?
  25. E-mail Alert on Root SSH Login
  26. How to Change Root password of CentOS / Fedora
  27. Change the SSH Port