FTP Proxy Problem ?

Tried using the FTP proxy as follows
Configured for Transparent mode
Advanced Tab = allowed servers = any

If I try and connect to ftp.astaro.com using filezilla, it makes a connection , but then the directory listing never shows - eventually times out.

If I disable the proxy everything works (as expected). If whilst connected I then enable the proxy , filezilla will list the directory , allow me to change directory etc.

If I do the same steps using Chrome browser , I can only conect when proxy is off, subsequently turning it on does not allow chrome to change directories etc like filezilla does.

So basically I am not sure if transparent mode is working correctly ??