Server-based password authentication
Using external authentication servers is desirable when multiple FortiGate units need to authenticate the same users, or where the FortiGate unit is added to a network that already contains an authentication server. FortiOS supports the use of LDAP, RADIUS, TACACS+, AD, or POP3 servers for authentication.
When you use an external authentication server to authenticate users, the FortiGate unit sends the user’s entered credentials to the external server. The password is encrypted. The server’s response indicates whether the supplied credentials are valid or not.
You must configure the FortiGate unit to access the external authentication servers that you want to use. The configuration includes the parameters that authenticate the FortiGate unit to the authentication server.
You can use external authentication servers in two ways:
- Create user accounts on the FortiGate unit. However, instead of storing each user’s password, specify the server used to authenticate that user. As with accounts that store the password locally, you add these users to appropriate user groups.
- Add the authentication server to user groups. Any user who has an account on the server can be authenticated and have the access privileges of the FortiGate user group. Optionally, when an LDAP server is a FortiGate user group member, you can limit access to users who belong to specific groups defined on the LDAP server.
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