What is the recommended method to secure remote access into a FortiGate unit?

Implementing a VPN (Virtual Private Network) is the recommended method to secure remote access into a FortiGate unit because it establishes a secure encrypted tunnel between the remote user and the FortiGate device. This encryption protects the data transmitted over potentially insecure public networks, preventing interception and unauthorized access. VPN technologies, such as IPsec or SSL, provide confidentiality, integrity, and authentication, ensuring that only authorized users can access the network resources.

Unlike allowing direct internet access, which exposes the FortiGate to various security threats, or relying on dynamic DNS and non-standard ports, which may not adequately secure the connection or could complicate management and monitoring, a VPN ensures a high level of security through robust encryption and authentication mechanisms. By using a VPN, organizations can enforce security policies and apply authentication measures, ensuring that remote access is both secure and controlled.