FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
kbahrudin_FTNT
Article Id 190373
Description
This article explains how to limit concurrent user authentication.  

Scope
User Authentication.  

Solution
The same user can be used for multiple concurrent authentications.  Its maximum number can be limited globally or per user-group only via CLI.

Globally
config system global
set policy-auth-concurrent <number_of_max_concurrent_users>
end

Per user-group
config user group
edit <group-name>
set auth-concurrent-override enable
set auth-concurrent-value <number_of_max_concurrent_users>
next
end

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