Technical Tip: How to resolve the error of 'client-leave-wtp' which cause Wifi connection unstable

WTP (Wireless Termination Point), which is a component of the wireless network infrastructure that connects wireless clients to the network. It is managed by a wireless controller, such as a FortiGate or FortiAP.

The above event indicates that a client device has disconnected from the WTP. This could be due to various reasons, such as the client moving out of range, manual disconnection, or network issues.

To manage client disconnections and optimize wireless performance, configure settings such as sticky client thresholds and transmission rates.

For example, change VAP configs in FortiGate as follows:

config wireless-controller vap
    edit "SSID"
        set rates-11bg 12-basic 18 24 36 48 54
        set rates-11a 12-basic 18 24 36 48 54

        set rates-11n-ss34 mcs16/3 mcs18/3 mcs20/3 mcs21/3 mcs22/3 mcs23/3 mcs24/4 mcs25/4
        set multicast-rate 12000
        set sticky-client-remove enable

            set probe-resp-suppression enable
        end

This improves the Wifi connection behavior and performance by sending management, broadcast, and multicast frames at a higher rate. To be effective, this adjustment must be done on all SSIDs broadcast on the same FortiAP and in all FortiAP devices in the same coverage area. Also, be careful to match the lowest basic rate and multicast-rate values to avoid FortiAP radio fallback on the lowest possible transmit rates (1 Mbps for 802.11b frames and 6 Mbps for 802.11a frames).

Caution:

Be advised that some older devices, like ones only supporting 802.11b, can no longer be used due to all supported b rates will be disabled.

This configuration will logically shorten cell coverage and may reveal areas with insufficient coverage. A Wi-Fi survey is highly recommended when using this adjustment to determine if a FortiAP placement change or the addition of more devices is necessary.

Related documents:

Technical Tip: Understanding the sticky client threshold behavior 

Ignoring weak or distant clients