Securing a Plesk server is crucial to protect your data, applications, and the server itself from potential threats. Here are steps you can take to enhance the security of your Plesk server:

1. Keep Software Updated:

   • Regularly update Plesk, as well as all installed software, including the operating system, web server, PHP, and any third-party applications.

2. Enable Firewall:

   • Use a firewall to control inbound and outbound traffic. Plesk includes a firewall management tool that allows you to set up rules for various services.

3. Use Secure Passwords:

   • Ensure that all user accounts, including root, have strong, unique passwords. Avoid using easily guessable passwords and consider using a password manager.

4. Implement Two-Factor Authentication (2FA):

   • Enable 2FA for Plesk and any other applications or services running on the server. This adds an extra layer of security by requiring a second form of authentication.

5. Disable Unnecessary Services:

   • Identify and disable any unnecessary services or ports to reduce potential attack vectors. Only run services that are essential for your applications.

6. Limit Access:

   • Restrict access to critical services and ports to only those who need them. Use tools like firewall rules and access control lists (ACLs) to manage access.

7. Regular Backups:

   • Set up regular backups of your data and configurations. This ensures you have a recent and reliable copy in case of data loss or a security breach.

8. Secure File Permissions:

   • Properly configure file and directory permissions to restrict access to sensitive files. Follow best practices for setting permissions.

9. SSL/TLS Encryption:

   • Enable SSL/TLS encryption for all websites and services. Use valid SSL certificates from trusted sources to encrypt data in transit.

10. Monitor Logs:

    • Regularly review logs for unusual activity, such as failed login attempts, unusual traffic patterns, or other security events.

11. Intrusion Detection Systems (IDS):

    • Consider implementing an IDS to monitor network traffic for suspicious activity and potential security breaches.

12. Antivirus and Malware Scanning:

    • Install and configure antivirus and anti-malware software to scan files and email for potential threats.

13. Disable Unneeded PHP Functions:

    • Restrict or disable certain PHP functions that may pose security risks. Plesk allows you to manage PHP settings.

14. Limit User Privileges:

    • Assign minimal privileges to users based on their roles. Only grant the necessary permissions for their specific tasks.

15. Regular Security Audits and Scans:

    • Conduct regular security audits and vulnerability scans to identify and address potential weaknesses.

16. Security Extensions and Tools:

    • Consider using security extensions or tools designed for Plesk to enhance security features.

17. Stay Informed:

    • Keep up-to-date with security news and advisories related to Plesk and its components. Stay informed about the latest security threats and best practices.

Remember, security is an ongoing process, and it's important to regularly review and update your security measures to adapt to evolving threats.