FTP over TLS not working

hi all,


i configured port redirection on ASA to allow external user access to Internal FTPS Server.  but it's not working

i use Filezilla client to access but i have this error.


Statut :    Connexion à x.x.x.x:21...

Statut :    Connexion établie, attente du message d'accueil...

Réponse :    220-Microsoft FTP Service

Réponse :    220 FTP-Server FTP

Commande :    AUTH TLS

Réponse :    234 AUTH command ok. Expecting TLS Negotiation.

Statut :    Initialisation de TLS...

Erreur :    Délai d'attente expiré

Erreur :    Impossible d'établir une connexion au serveur



please can somebody know what can cause this issue ?


thanks for your help


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