To protect your dedicated server, it is essential to implement several security measures. Firstly, keep the server's operating system, control panels, and other software up to date with the latest security patches. Implement a robust firewall to filter network traffic and only allow necessary ports to remain open. Utilize strong and unique passwords for all user accounts and regularly change them. Implement intrusion detection and prevention systems and antivirus and malware scanning tools. Regularly back up your data to remote locations, and consider employing encryption for sensitive information. Lastly, periodically monitor server logs and watch for any suspicious activities.