FTP Data Connection Error

Hello!
I have a RUT956 (9M_R_00.07.09.1) on which i connected 2 FTP Servers that i want to acces via WAN interface of the router, using port forwardings. As i have 2 servers, i had to configure 2 different external ports to redirect to the specific server that i want to acces. I can establish the connection, each server ask me for login creditentials, but after establishing that, i can’t get any file list from them.
Tried to connect via classic windows power shell(cmd), i get “425 No data connection” error. I tried with a FileZIlla Client app, same error.

The idea is that if i try to configure port forward rule, with the classic ftp port(21) as external port it works just fine.
Here is the configuration i did!



Any idea on how can i solve it? Thanks in regard!

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