FileZilla Forums

My Internet connexion works fine. I can watch YouTube videos with no problem. My firewall is Windows Defender. Filezilla is already allowed through the firewall (every port).
But when I click on 'edit' -> 'Network setup assistant', it always blocks at '150 opening data connection', and ends up with an error "503 Failure of data connection. Le serveur a envoyé une réponse inattendue. Connexion interrompue"
How could I fix this ? Also I checked https://wiki.filezilla-project.org/Netw ... figuration and couldn't find anything useful.

Please post a complete log of this happening.

""Connexion à probe.filezilla-project.org
Connexion établie, attente du message d'accueil.
Réponse : 220 FZ router and firewall tester ready
USER FileZilla
Réponse : 331 Give any password.
PASS 3.48.1
Réponse : 230 logged on.
Vérification de l'adresse IP externe correcte
IP (my correct ip) hh-bjh-cbc-bfi
Réponse : 200 OK
PREP 56876
Réponse : 200 Using port 56876, data token 406280896
PORT (the first forth numbers are my ip) ,222,44
Réponse : 200 PORT command successful
LIST
Réponse : 150 opening data connection
Réponse : 503 Failure of data connection.
Le serveur a envoyé une réponse inattendue.
Connexion interrompue""

That's everything I have. The only not working part is "503 Failure of data connection."

The wizard always tests active mode FTP in the end, which requires all firewalls and NAT routers to be configured accordingly, please refer to our Network Configuration guide for details.

According to the test log, the port chosen out of the configured range was not reachable from the Internet.

I checked the guide already, and rechecked it again and again, and I just can't find anything useful. I can't add a port to my box, there's no option for it. It automatically adds ports with the UPnP.
Does FileZilla can use UPnP ?

If you cannot configure your router you simply cannot use active mode FTP.