The NetScaler appliance sends probes to the services through the monitors bound to the services. By default, the monitor on the NetScaler and the physical server follow the complete handshake procedure even for monitor probes. However, this procedure adds overhead to the monitoring process and may not be always necessary.
For the TCP monitors, you can configure the NetScaler to close a monitor-probe connection after receiving SYN-ACK from the service. To do so, set the value of the monitorConnectionClose parameter to RESET. If you want the monitor-probe connection to go through the complete procedure, set the value to FIN.
At the command prompt, type:
set lb parameter -monitorConnectionClose RESET