Merci pour vos conseils,
mais malgrès la désactivation de zone alarm et le téléchargement et la configuration (avec un tutorial) de BulletProof FTP Server ca ne change rien.
Pour le test voici le résultat que je ne comprend pas

.
* About to connect() to carna62.no-ip.org port 21
* Trying 89.224.105.91... connected
* Connected to carna62.no-ip.org (89.224.105.91) port 21
< 220
ftp://carna62.no-ip.org/
> USER qena
< 331 Password required for qena.
> PASS *****
< 230 User qena logged in.
> PWD
< 257 "/" is current directory.
* Entry path is '/'
> CLNT Testing from
http://www.g6ftpserver.com/ftptest from IP 89.224.105.91
< 200 "Testing from
http://www.g6ftpserver.com/ftptest from IP 89.224.105.91" noted.
> FEAT
< 211-Extensions supported:
< CLNT
< MDTM
< PASV
< REST STREAM
< SIZE
< 211 End.
> PASV
* Connect data stream passively
< 227 Entering Passiv Mode (89,224,105,91,11,74)
* Trying 89.224.105.91... connected
* Connecting to 89.224.105.91 (89.224.105.91) port 2890
> TYPE A
< 200 Type set to A.
> LIST
< 150 Data connection accepted from 87.98.200.117:4319; transfer starting.
< 226 Transfer ok
* Connection #0 to host carna62.no-ip.org left intact
> QUIT
* FTP response reading failed
* Closing connection #0
Je vous remercie d'avance de votre analyse
