ADC

FTP service monitoring

September 27, 2025

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To monitor FTP services, the Citrix® ADC appliance opens two connections to the FTP server. It first connects to the control port, which is used to transfer commands between a client and an FTP server. After it receives the expected response, it connects to the data port, which is used to transfer files between a client and an FTP server. Only when the FTP server responds as expected, on both the connections, it is marked UP.

Note: Monitor probes originate from the NSIP address.

The Citrix ADC appliance has two built-in monitors for FTP services: the FTP monitor and the FTP-EXTENDED monitor. The FTP-EXTENDED monitor is a scriptable monitor. It uses the nsftp.pl script. The FTP-EXTENDED monitor script is enhanced to send secure probes to FTP services. You can create a monitor of type FTP-EXTENDED. The nsftp.pl script is automatically taken from the default directory.

To send secure FTP probes to FTP services by using the CLI

At the command prompt, type:

add lb monitor <monitorName> <type> -username <string> -password <string> -filename <filename>
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Example

add monitor mon1 FTP-EXTENDED -username root -password freebsd -filename fsdf
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To send secure FTP probes to FTP services by using the GUI

Navigate to Traffic Management > Load Balancing > Monitors.
Specify the monitor type as FTP-EXTENDED, and set the parameters.
In Special Parameters, specify a File Name, User Name, and Password.

To configure built-in monitors to check the state of FTP services, see Configuring Monitors in a Load Balancing Setup.

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NetScaler Secure Deployment Guide

FTP service monitoring

September 27, 2025

Contributed by:

September 27, 2025

Contributed by:

FTP service monitoring

To send secure FTP probes to FTP services by using the CLI

To send secure FTP probes to FTP services by using the GUI

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