ipcop firewall problem

we had installed IPCOP 1.4.20 with this modules:
blockouttrafic 3.0

when we try to connect from an internal pc with filezilla ftp client to an external ftp we receive the following answer:
Stato:        Connessione a
Stato:        Connessione stabilita, in attesa del messaggio di benvenuto...
Risposta:       220 Microsoft FTP Service
Comando:       AUTH TLS
Risposta:       234 AUTH command ok. Expecting TLS Negotiation.
Stato:        Inizializzazione TLS in corso...
Errore:       Impossibile collegarsi al server
Who is Participating?
Pierre FrançoisConnect With a Mentor Senior consultantCommented:
I deduce you are using FTPS (FTP secure) instead of FTP, also called FTP over TLS/SSL.  For this protocol, you need to open also TCP and UDP ports 989 and 990. See <http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers>.
Pierre FrançoisSenior consultantCommented:
You need to go to the block out traffic (BOT) interface and to open tcp ports 20 and 21 for allowing outgoing FTP services. Seeing the error messages, probably you opened one of both ports but not the other.

robygrilloAuthor Commented:
The port 20 and 21 are already open in bot interface, maybe is a problem related to the TLS certificate that the remote ftp server try to send us  
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