FTP probe

This probe allows to connect to an FTP directory and get information about its files and folders.

Settings example

Field Description


Server IP address or DNS name.


Port number (default 21).


Secure FTP connection over SSL/TLS.


FTP username.


FTP password.

Base directory

Path to the directory where located folders and files are accessible for the user.

File mask

File mask to filter directory content.

Display file names

Displaying file names, stored in the directory, in the Data table.

Calculate directory sizes

Displaying the total size of the subfolders in the directory in the Data table.


Maximum time to perform the check in milliseconds (30 seconds by default).


How often to perform the check (60 seconds by default).


After the check has been done result is displayed in the Data table:

Field Description


Amount of files in the specified directory.


Size of the specified directory or the total size of all subdirectories with files if the mode Calculate directory sizes is on.


Maximum file size in the directory.


Minimum file size in the directory.


Date of the first directory change.


Date of the last directory change.


Names of files nested in directories if the mode Display file names is on.

Command-line utility

Execution of the same check in the terminal:

ftp> open
(to) 21
Connected to
220 (vsFTPd 3.0.2)
Name ( mbox
331 Please specify the password.
230 Login successful.
Remore system type is UNIX.
Using Binary mode to transfer files.
ftp> ls 2V422-ZWEQ4-SJMFZ-ZR849-U8461/2017_03_21_17_10_02
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
-rwxrwxrwx   1 1006    33     2299570 Mar 21 2017 1_149011621125.mp4
-rwxrwxrwx   1 1006    33     2327385 Mar 21 2017 1_14901162199.mp4
-rwxrwxrwx   1 1006    33     2258241 Mar 21 2017 2_149011621123.mp4
-rwxrwxrwx   1 1006    33     2203334 Mar 21 2017 2_149011621988.mp4
226 Directory send OK.

Known problems and errors

Sensor error! Authentication failed.

Authentication error.

Check the correctness of the data specified in the fields Login and Password.

Sensor error! No route to host.

Host unreachable.

Probable reasons:

  • the specified hostname is incorrect;

  • the specified hostname is not available from the network, where the check was performed;

  • the specified host (server) is down.

Check the correctness of the specified host address.

Sensor error! Connection refused (Connection refused).

Probable reasons:

  • the specified port number is incorrect;

  • firewall blocks the specified port.

Check the correctness of the specified port number (21 by default).

Check the firewall rules and make sure that the specified port is not among the blocked ports.