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Aucun accès aux dossiers du serveur FTP: 425 Can't open data connection for transfer of "/
03/26/2020 
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Description
Depuis une zone locale comme le LAN ou DMZ, vous pouvez acceder a votre serveur FTP. Mais depuis le WAN, la connexion est refusée.
Si vous faites un packet monitor, vous verrez que les paquets sont envoyés correctement au serveur FTP mais que celui-ci vous montre l'erreur suivante:
425 Can't open data connection for transfer of "/"
Il est possible que ce server FTP n'accepte pas de connexion ayant comme source une adresse IP publique.
Resolution
Assurez vous d'avoir configuré le serveur FTP en suivant les guides suivants
Configuration for a Passive Mode FTP Server behind the SonicWall. (SW10090)
Une méthode de contourner le problème peut être de créer une règle de NAT pour changer la source publique vers une adresse privée.
Original Source : ANY
Translated Source : A private IP address
Original Destination : FTP Server Public (typically X1 or a WAN interface)
Translated Destination : Private IP address FTP Server
Original Service : FTP Custom Group
Translated Service : ORIGINAL
Inbound Interface : X1 (or the WAN interface used)
Outbound Interface : Any
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Categories
- Firewalls > SonicWall NSA Series
- Firewalls > SonicWall SuperMassive 9000 Series
- Firewalls > SonicWall SuperMassive E10000 Series
- Firewalls > TZ Series
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