ftp backup issue

Hi,

Been using Acronis Backup for a while to local storage & works fine but recently wanted to backup to a remote ftp server but hit a problem.

I can create an ftp server with my router using an attached hard drive and also an ftp server with my QNAP NAS and both work with regular ftp software etc.

With Acronis Backup I can navigate to the remote ftp servers and can even connect to them fine & backup if leaving open connection (not a good idea) but if I enable username/password I always get Acronis Backup stating a fail with no correct username or password.

Any idea why or anyone have a solution ?