There are several ways to prevent unauthorized access to FTP:
1. Strong Passwords: Ensure that all FTP accounts have strong passwords that are hard to guess.
1. User Authentication: Use user authentication mechanisms like usernames and passwords for access control.
1. Encryption: Use encryption mechanisms like SFTP (Secure File Transfer Protocol) or FTPS (FTP over SSL/TLS) to encrypt the data in transit.
1. Firewall: Configure a firewall to block unwanted traffic and allow only authorized IP addresses to connect to the FTP server.
1. Access Control Lists (ACLs): Configure ACLs to limit access to specific directories and files.
1. Disable Anonymous FTP: Disable anonymous FTP access in the FTP server settings.
1. Regular updates: Keep the FTP server software up-to-date to address known vulnerabilities and security issues.
1. Monitoring: Implement a system to monitor access logs for unusual activity and unauthorized access attempts.
1. Two-factor authentication: Implement two-factor authentication (2FA) for added security.
