When user authentication is enabled on a security policy, the authentication challenge is normally issued for any of the four protocols, HTTP, HTTPS, FTP, and Telnet, which are dependent on the connection protocol. By making selections in the Protocol Support list, the user controls which protocols support the authentication challenge. The user must connect with a supported protocol first, so that they can subsequently connect with other protocols.
For example, if you have selected HTTP, FTP, or Telnet, a username and password-based authentication occurs. The FortiGate unit then prompts network users to input their security username and password. If you have selected HTTPS, certificate-based authentication (HTTPS, or HTTP redirected to HTTPS only) occurs.
FTP and Telnet authentication replacement messages cannot be customized. For HTTP and HTTPS replacement messages see Authentication replacement messages on page 503.
For certificate-based authentication, you must install customized certificates on the FortiGate unit and on the browsers of network users. If you do not install certificates on the network user’s web browser, the network users may see an SSL certificate warning message and have to manually accept the default FortiGate certificate. The network user’s web browser may deem the default certificate as invalid.
When you use certificate authentication, if you do not specify any certificate when you create the security policy, the global settings are used. If you specify a certificate, the per-policy setting will overwrite the global setting. For more information about the use of certification authentication see Certificate-based authentication on page 522.
To set the authentication protocols
1. Go to User & Device > Authentication > Settings.
2. In Protocol Support, select the required authentication protocols.
3. If using HTTPS protocol support, in Certificate, select a Local certificate from the drop-down list.
4. Select Apply.
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