Ubuntu Passive FTP with proftpd

Hi,

I try to configure  a FTP server on Ubuntu with Proftpd on Azure IaaS.

My filezilla client timeouts at :

Commande :	MLSD
Réponse :	150 Opening ASCII mode data connection for MLSD

I configured my passive ports and Maskerade Address

I opened all the passive ports as endpoints in the dashboard.

I have a virtual network and a site to site VPN, the connexion with the private IP address works fine.

Any clue ?

Thanks.

R.