451 Command denied by firewall

[Stephen]

Thank you very much MxxCon,

the error message little changes to:

425 Can't build data connection: Connection refused.

here is a log:

[11:35:51] 227 Entering Passive Mode (80,129,10,15,228,69).
[11:35:51] PORT 80,129,10,15,228,69
[11:35:51] 200 PORT command successful.
[11:35:51] STOR test.txt
[11:35:53] RETR test.txt
[11:35:53] 425 Can't build data connection: Connection refused.
[11:35:53] Transfer Failed!

Any other ideas, please ?