Nothing to restore displayed, restoring from FTP server

Restoring from FTP server will display nothing to restore
This is ftp log :

> CWD backups//
> 250 CWD successful. "backups" is current directory.
> TYPE A
> 200 Type set to A
> PORT 80,81,88,251,187,236
> 200 Port command successful
> NLST
> 150 Opening data channel for directory list.
> 226 Successfully transferred ""
> PORT 80,81,88,251,172,127
> 200 Port command successful
> LIST -d1 */
> 550 Directory not found.
> QUIT
> 221 Goodbye
> disconnected.

perhaps that "LIST -d1 */ " command is not liked by server...
tried on microsoft IIS ftp server as well on filezilla server

on the above ftp server, the directory "backups" contains a subdirectory named "test" in wich is present the .tgz backup file previously created by backup module itself