Chapter 17 System Administration : PPTP and L2TP : FortiGate unit as a PPTP server : Configuring user authentication for PPTP clients
  
Configuring user authentication for PPTP clients
To enable authentication for PPTP clients, you must create user accounts and a user group to identify the PPTP clients that need access to the network behind the FortiGate unit. Within the user group, you must add a user for each PPTP client.
You can choose to use a plain text password for authentication or forward authentication requests to an external RADIUS, LDAP, or TACACS+ server. If password protection will be provided through a RADIUS, LDAP, or TACACS+ server, you must configure the FortiGate unit to forward authentication requests to the authentication server.
This example creates a basic user/password combination.
See Also
Configuring a user account
Configuring a user group
FortiGate unit as a PPTP server
Configuring user authentication for PPTP clients
Enabling PPTP and specifying the PPTP IP address range
Adding the security policy
PPTP and L2TP