Multiple admin sessions can occur when multiple users access the FortiGate using the same admin account. By default, the FortiGate unit enables multiple logins of administrators using the same login credentials from different locations. To control admin log ins, and minimize the potential of configuration collisions, you can disable concurrent admin sessions. When disabled, only one user can use the admin account at a time. When a second admin attempts to connect, connection is denied with a message that the login attempt failed.

On 2U FortiGate units, this option is also available in the Web-Based Manager by going to System > Admin > Settings and select Allow each admin to log in with multiple sessions.