Voilà désormais ce que j'obtiens avec le site de test de ftp :
* About to connect() to gosu.serveftp.com port 21
* Trying **.***.***.**... connected
* Connected to ****.serveftp.com (**.***.***.**) port 21
< 220 Serv-U FTP Server v6.1 for WinSock ready...
> USER pot
< 331 User name okay, need password.
> PASS *****
< 230 User logged in, proceed.
> PWD
< 257 "/" is current directory.
* Entry path is '/'
> CLNT Testing from
http://www.g6ftpserver.com/ftptest from IP **.***.***.**
< 200 Noted.
> FEAT
< 211-Extension supported
< CLNT
< MDTM
< MDTM YYYYMMDDHHMMSS[+-TZ];filename
< SIZE
< SITE PSWD;EXEC;SET;INDEX;ZONE;CHMOD;MSG
< REST STREAM
< XCRC filename;start;end
< MODE Z
< MLST Type*;Size*;Create;Modify*;Win32.ea*;
< 211 End
> PASV
* Connect data stream passively
< 227 Entering Passive Mode (**.***.***.**,5,52)
* Trying **.***.***.**... Timed out
* couldn't connect to host
* Connection #0 to host ****.serveftp.com left intact
* Closing connection #0
Une idée pour régler le problème ?