The maximum number of FortiClient agents that FortiClient Manager can support depends on which FortiManager model you have.

The FortiManager system logs alerts when the number of managed FortiClient agents reaches 90 percent and 95 percent of the maximum. When the maximum is reached, the system raises an alert for every attempt to add another FortiClient agent. The FortiManager unit can continue to search for FortiClient agent, but it can add them only to the Temporary Clients list.

If the number of FortiClient agents that you want to support exceeds the capacity of your FortiManager unit, you can create a FortiClient Manager cluster of two or more FortiManager units. See “About FortiClient Manager clustering”.