I am using Filezilla as the ftp client.
Here is an example of another error I received today:
Status:Connected
Status:Retrieving directory listing...
Command:PWD
Response:257 "/" is the current directory
Command:TYPE I
Response:200 Type set to I
Command:PASV
Response:227 Entering Passive Mode (192,168,1,200,184,178).
Status:Server sent passive reply with unroutable address. Using server address instead.
Command:MLSD
Error:Connection timed out
Error:Failed to retrieve directory listing?