Unable to list contents of hidden folders

[Krawma]

I log into open account and then CWD to the hidden folder by entering a custom command. I then try to list the files in the folder using the LIST custom command and receive the error: 425 Can't open data connection. The log follows:

............
Command: USER ThisIsUN
Response: 331 Password required for ThisIsUN.
Command: PASS
Response: 230-Welcome
Response: 230 User ThisIsUN logged in.
Command: SYST
Response: 215 Windows_NT
Command: FEAT
Response: 211-FEAT
Response: SIZE
Response: MDTM
Response: 211 END
Status: Connected
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/ThisIsUN" is current directory.
Command: TYPE I
Response: 200 Type set to I.
Command: PASV
Response: 227 Entering Passive Mode (<removed by user for bug report submission>).
Command: LIST
Response: 125 Data connection already open; Transfer starting.
Response: 226 Transfer complete.
Command: PASV
Response: 227 Entering Passive Mode (<removed by user for bug report submission>).
Command: LIST -a
Response: 125 Data connection already open; Transfer starting.
Response: 226 Transfer complete.
Status: Directory listing successful
Command: CWD HiddenDir
Response: 250 CWD command successful.
Command: PWD
Response: 257 "/ThisIsUN/HiddenDir" is current directory.
Command: LIST -a
Response: 150 Opening BINARY mode data connection for /bin/ls.
Response: 425 Can't open data connection.

I use Windows XP Professional and FileZilla 3.1.3.1 (Build 29-Sep-2008)

[Tim Kosse]

You cannot manually use LIST, you need to use PASV or PORT command first and then establish a transfer connection.

Contact the server administrator to configure the server properly. Only a broken server hides files from the user.